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160-715: The experiment was a collaboration between the Massachusetts Institute of Technology , the Haystack Observatory , the NASA/ Caltech Jet Propulsion Laboratory , with OxEon Energy. MOXIE's objective was to produce oxygen of at least 98% purity at a rate of 6–10 grams per hour (0.21–0.35 oz/h) and to do this at least ten times, so the device can be tested in a range of times of the day, including at night, and in most environmental conditions, including during

320-514: A dinitrogen complex to be discovered was [Ru(NH 3 ) 5 (N 2 )] (see figure at right), and soon many other such complexes were discovered. These complexes , in which a nitrogen molecule donates at least one lone pair of electrons to a central metal cation, illustrate how N 2 might bind to the metal(s) in nitrogenase and the catalyst for the Haber process : these processes involving dinitrogen activation are vitally important in biology and in

480-553: A dust storm . MOXIE builds upon an earlier experiment, the Mars In-situ propellant production Precursor (MIP), which was designed and built to fly on the Mars Surveyor 2001 Lander mission. MIP was intended to demonstrate In-Situ Propellant Production (ISPP) on a laboratory scale using electrolysis of carbon dioxide to produce oxygen. The MIP flight demonstration was postponed when the Mars Surveyor 2001 lander mission

640-442: A towing tank for testing ship and ocean structure designs, and previously Alcator C-Mod , which was the largest fusion device operated by any university. MIT's campus-wide wireless network was completed in the fall of 2005 and consists of nearly 3,000 access points covering 9.4 × 10 ^  sq ft (870,000 m ) of campus. The campus' primary energy source is natural gas. In connection with capital campaigns to expand

800-401: A "technological" research university and to build more autonomy from private industry. In the 1930s, President Karl Taylor Compton and Vice-President (effectively Provost ) Vannevar Bush emphasized the importance of pure sciences like physics and chemistry and reduced the vocational practice required in shops and drafting studios. The Compton reforms "renewed confidence in the ability of

960-473: A bridging ligand, donating all three electron pairs from the triple bond ( μ 3 -N 2 ). A few complexes feature multiple N 2 ligands and some feature N 2 bonded in multiple ways. Since N 2 is isoelectronic with carbon monoxide (CO) and acetylene (C 2 H 2 ), the bonding in dinitrogen complexes is closely allied to that in carbonyl compounds, although N 2 is a weaker σ -donor and π -acceptor than CO. Theoretical studies show that σ donation

1120-471: A colourless and odourless diatomic gas . N 2 forms about 78% of Earth's atmosphere , making it the most abundant chemical species in air. Because of the volatility of nitrogen compounds, nitrogen is relatively rare in the solid parts of the Earth. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772 and independently by Carl Wilhelm Scheele and Henry Cavendish at about

1280-600: A dense high-rise transit-oriented development plan. The MIT Museum has moved immediately adjacent to a Kendall Square subway entrance, joining the List Visual Arts Center on the eastern end of the campus. Each building at MIT has a number (possibly preceded by a W , N , E , or NW ) designation, and most have a name as well. Typically, academic and office buildings are referred to primarily by number while residence halls are referred to by name. The organization of building numbers roughly corresponds to

1440-564: A desperate search for a new campus and funding. Eventually, the MIT Corporation approved a formal agreement to merge with Harvard and move to Allston, over the vehement objections of MIT faculty, students, and alumni. The merger plan collapsed in 1905 when the Massachusetts Supreme Judicial Court rules that MIT could not sell its Back Bay land. In 1912, MIT acquired its current campus by purchasing

1600-426: A dilute gas it is less dangerous and is thus used industrially to bleach and sterilise flour. Nitrogen tribromide (NBr 3 ), first prepared in 1975, is a deep red, temperature-sensitive, volatile solid that is explosive even at −100 °C. Nitrogen triiodide (NI 3 ) is still more unstable and was only prepared in 1990. Its adduct with ammonia, which was known earlier, is very shock-sensitive: it can be set off by

1760-676: A first for a non-industrial – much less university – building in the US. Bosworth's design was influenced by the City Beautiful Movement of the early 1900s and features the Pantheon -esque Great Dome housing the Barker Engineering Library. The Great Dome overlooks Killian Court, where graduation ceremonies are held each year. The friezes of the limestone-clad buildings around Killian Court are engraved with

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1920-498: A liquid, it is a very good solvent with a high heat of vaporisation (enabling it to be used in vacuum flasks), that also has a low viscosity and electrical conductivity and high dielectric constant , and is less dense than water. However, the hydrogen bonding in NH 3 is weaker than that in H 2 O due to the lower electronegativity of nitrogen compared to oxygen and the presence of only one lone pair in NH 3 rather than two in H 2 O. It

2080-483: A long time, sources of nitrogen compounds were limited. Natural sources originated either from biology or deposits of nitrates produced by atmospheric reactions. Nitrogen fixation by industrial processes like the Frank–Caro process (1895–1899) and Haber–Bosch process (1908–1913) eased this shortage of nitrogen compounds, to the extent that half of global food production now relies on synthetic nitrogen fertilisers. At

2240-534: A mile along the north side of the Charles River basin. The campus is divided roughly in half by Massachusetts Avenue , with most dormitories and student life facilities to the west and most academic buildings to the east. The bridge closest to MIT is the Harvard Bridge , which is known for being marked off in a non-standard unit of length – the smoot . The Kendall/MIT MBTA Red Line station

2400-488: A modest fee. The " edX " online platform supporting MITx was initially developed in partnership with Harvard and its analogous "Harvardx" initiative. The courseware platform is open source, and other universities have already joined and added their own course content. In March 2009 the MIT faculty adopted an open-access policy to make its scholarship publicly accessible online. MIT has its own police force. Three days after

2560-496: A new Schwarzman College of Computing dedicated to the study of artificial intelligence, named after lead donor and The Blackstone Group CEO Stephen Schwarzman . The focus of the new college is to study not just AI, but interdisciplinary AI education, and how AI can be used in fields as diverse as history and biology. The cost of buildings and new faculty for the new college is expected to be $ 1 billion upon completion. The Laser Interferometer Gravitational-Wave Observatory (LIGO)

2720-678: A one-mile (1.6 km) tract of filled lands along the Cambridge side of the Charles River. The neoclassical "New Technology" campus was designed by William W. Bosworth and had been funded largely by anonymous donations from a mysterious "Mr. Smith", starting in 1912. In January 1920, the donor was revealed to be the industrialist George Eastman , an inventor of film production methods and founder of Eastman Kodak . Between 1912 and 1920, Eastman donated $ 20 million ($ 304.2 million in 2024 dollars) in cash and Kodak stock to MIT. In 1916, with

2880-405: A polytechnic school is, as I conceive, the teaching, not of the minute details and manipulations of the arts, which can be done only in the workshop, but the inculcation of those scientific principles which form the basis and explanation of them, and along with this, a full and methodical review of all their leading processes and operations in connection with physical laws. The Rogers Plan reflected

3040-494: A preference for forming multiple bonds, typically with carbon, oxygen, or other nitrogen atoms, through p π –p π interactions. Thus, for example, nitrogen occurs as diatomic molecules and therefore has very much lower melting (−210 °C) and boiling points (−196 °C) than the rest of its group, as the N 2 molecules are only held together by weak van der Waals interactions and there are very few electrons available to create significant instantaneous dipoles. This

3200-640: A primary fuel. As an alternative use, an oxygen generation system could fill a small oxygen tank as fuel-oxidiser to support a sample return mission . The oxygen could also be combined with hydrogen to form water. Data from NASA (MARS 2020 Mission Perseverance Rover), Ceramatec and OxEon Energy, NASA Jet Propulsion Laboratory. MOXIE: Operational Design Drive (SOXE): MOXIE: Materials Design Drivers: MOXIE: Cell design: Connecting cells: MOXIE: Gas delivery system (scroll compressor): MOXIE: Targets: Massachusetts Institute of Technology The Massachusetts Institute of Technology ( MIT )

3360-591: A problem which is only exacerbated by its low gyromagnetic ratio , (only 10.14% that of H). As a result, the signal-to-noise ratio for H is about 300 times as much as that for N at the same magnetic field strength. This may be somewhat alleviated by isotopic enrichment of N by chemical exchange or fractional distillation. N-enriched compounds have the advantage that under standard conditions, they do not undergo chemical exchange of their nitrogen atoms with atmospheric nitrogen, unlike compounds with labelled hydrogen , carbon, and oxygen isotopes that must be kept away from

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3520-470: A promising ceramic if not for the difficulty of working with and sintering it. In particular, the group 13 nitrides, most of which are promising semiconductors , are isoelectronic with graphite, diamond, and silicon carbide and have similar structures: their bonding changes from covalent to partially ionic to metallic as the group is descended. In particular, since the B–N unit is isoelectronic to C–C, and carbon

3680-463: A significant dynamic surface coverage on Pluto and outer moons of the Solar System such as Triton . Even at the low temperatures of solid nitrogen it is fairly volatile and can sublime to form an atmosphere, or condense back into nitrogen frost. It is very weak and flows in the form of glaciers, and on Triton geysers of nitrogen gas come from the polar ice cap region. The first example of

3840-421: A special type of educational institution which can be defined as a university polarized around science, engineering, and the arts. We might call it a university limited in its objectives but unlimited in the breadth and the thoroughness with which it pursues these objectives. —MIT president James Rhyne Killian These activities affected MIT profoundly. A 1949 report noted the lack of "any great slackening in

4000-606: A very high energy density, that could be used as powerful propellants or explosives. Under extremely high pressures (1.1 million  atm ) and high temperatures (2000 K), as produced in a diamond anvil cell , nitrogen polymerises into the single-bonded cubic gauche crystal structure. This structure is similar to that of diamond , and both have extremely strong covalent bonds , resulting in its nickname "nitrogen diamond". At atmospheric pressure , molecular nitrogen condenses ( liquefies ) at 77  K (−195.79 ° C ) and freezes at 63 K (−210.01 °C) into

4160-465: Is oxatetrazole (N 4 O), an aromatic ring. Nitrous oxide (N 2 O), better known as laughing gas, is made by thermal decomposition of molten ammonium nitrate at 250 °C. This is a redox reaction and thus nitric oxide and nitrogen are also produced as byproducts. It is mostly used as a propellant and aerating agent for sprayed canned whipped cream , and was formerly commonly used as an anaesthetic. Despite appearances, it cannot be considered to be

4320-439: Is ONF 3 , which has aroused interest due to the short N–O distance implying partial double bonding and the highly polar and long N–F bond. Tetrafluorohydrazine, unlike hydrazine itself, can dissociate at room temperature and above to give the radical NF 2 •. Fluorine azide (FN 3 ) is very explosive and thermally unstable. Dinitrogen difluoride (N 2 F 2 ) exists as thermally interconvertible cis and trans isomers, and

4480-517: Is a chemical element ; it has symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table , often called the pnictogens . It is a common element in the universe , estimated at seventh in total abundance in the Milky Way and the Solar System . At standard temperature and pressure , two atoms of the element bond to form N 2 ,

4640-543: Is a private research university in Cambridge, Massachusetts , United States. Established in 1861, MIT has played a significant role in the development of many areas of modern technology and science . Founded in response to the increasing industrialization of the United States , MIT adopted a European polytechnic university model and stressed laboratory instruction in applied science and engineering . MIT

4800-419: Is a fuming, colourless liquid that smells similar to ammonia. Its physical properties are very similar to those of water (melting point 2.0 °C, boiling point 113.5 °C, density 1.00 g/cm ). Despite it being an endothermic compound, it is kinetically stable. It burns quickly and completely in air very exothermically to give nitrogen and water vapour. It is a very useful and versatile reducing agent and

4960-497: Is a large, highly residential, research university with a majority of enrollments in graduate and professional programs. The university has been accredited by the New England Association of Schools and Colleges since 1929. MIT operates on a 4–1–4 academic calendar with the fall semester beginning after Labor Day and ending in mid-December, a 4-week "Independent Activities Period" in the month of January, and

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5120-491: Is a more important factor allowing the formation of the M–N bond than π back-donation, which mostly only weakens the N–N bond, and end-on ( η ) donation is more readily accomplished than side-on ( η ) donation. Today, dinitrogen complexes are known for almost all the transition metals , accounting for several hundred compounds. They are normally prepared by three methods: Occasionally

5280-467: Is a weak base in aqueous solution ( p K b 4.74); its conjugate acid is ammonium , NH 4 . It can also act as an extremely weak acid, losing a proton to produce the amide anion, NH 2 . It thus undergoes self-dissociation, similar to water, to produce ammonium and amide. Ammonia burns in air or oxygen, though not readily, to produce nitrogen gas; it burns in fluorine with a greenish-yellow flame to give nitrogen trifluoride . Reactions with

5440-401: Is a weak diprotic acid with the structure HON=NOH (p K a1 6.9, p K a2 11.6). Acidic solutions are quite stable but above pH 4 base-catalysed decomposition occurs via [HONNO] to nitrous oxide and the hydroxide anion. Hyponitrites (involving the N 2 O 2 anion) are stable to reducing agents and more commonly act as reducing agents themselves. They are an intermediate step in

5600-399: Is a weaker base than ammonia. It is also commonly used as a rocket fuel. Hydrazine is generally made by reaction of ammonia with alkaline sodium hypochlorite in the presence of gelatin or glue: (The attacks by hydroxide and ammonia may be reversed, thus passing through the intermediate NHCl instead.) The reason for adding gelatin is that it removes metal ions such as Cu that catalyses

5760-612: Is also evidence for the asymmetric red dimer O=N–O=N when nitric oxide is condensed with polar molecules. It reacts with oxygen to give brown nitrogen dioxide and with halogens to give nitrosyl halides. It also reacts with transition metal compounds to give nitrosyl complexes, most of which are deeply coloured. Blue dinitrogen trioxide (N 2 O 3 ) is only available as a solid because it rapidly dissociates above its melting point to give nitric oxide, nitrogen dioxide (NO 2 ), and dinitrogen tetroxide (N 2 O 4 ). The latter two compounds are somewhat difficult to study individually because of

5920-404: Is essentially intermediate in size between boron and nitrogen, much of organic chemistry finds an echo in boron–nitrogen chemistry, such as in borazine ("inorganic benzene "). Nevertheless, the analogy is not exact due to the ease of nucleophilic attack at boron due to its deficiency in electrons, which is not possible in a wholly carbon-containing ring. The largest category of nitrides are

6080-515: Is known. Industrially, ammonia (NH 3 ) is the most important compound of nitrogen and is prepared in larger amounts than any other compound because it contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilisers. It is a colourless alkaline gas with a characteristic pungent smell. The presence of hydrogen bonding has very significant effects on ammonia, conferring on it its high melting (−78 °C) and boiling (−33 °C) points. As

6240-593: Is located on the northeastern edge of the campus, in Kendall Square . The Cambridge neighborhoods surrounding MIT are a mixture of high tech companies occupying both modern office and rehabilitated industrial buildings, as well as socio-economically diverse residential neighborhoods. In early 2016, MIT presented its updated Kendall Square Initiative to the City of Cambridge, with plans for mixed-use educational, retail, residential, startup incubator, and office space in

6400-434: Is mildly toxic in concentrations above 100 mg/kg, but small amounts are often used to cure meat and as a preservative to avoid bacterial spoilage. It is also used to synthesise hydroxylamine and to diazotise primary aromatic amines as follows: Nitrite is also a common ligand that can coordinate in five ways. The most common are nitro (bonded from the nitrogen) and nitrito (bonded from an oxygen). Nitro-nitrito isomerism

6560-629: Is mostly unreactive at room temperature, but it will nevertheless react with lithium metal and some transition metal complexes. This is due to its bonding, which is unique among the diatomic elements at standard conditions in that it has an N≡N triple bond . Triple bonds have short bond lengths (in this case, 109.76 pm) and high dissociation energies (in this case, 945.41 kJ/mol), and are thus very strong, explaining dinitrogen's low level of chemical reactivity. Other nitrogen oligomers and polymers may be possible. If they could be synthesised, they may have potential applications as materials with

Mars Oxygen ISRU Experiment - Misplaced Pages Continue

6720-489: Is much more common, making up 99.634% of natural nitrogen, and the second (which is slightly heavier) makes up the remaining 0.366%. This leads to an atomic weight of around 14.007 u. Both of these stable isotopes are produced in the CNO cycle in stars , but N is more common as its proton capture is the rate-limiting step. N is one of the five stable odd–odd nuclides (a nuclide having an odd number of protons and neutrons);

6880-682: Is not possible for its vertical neighbours; thus, the nitrogen oxides , nitrites , nitrates , nitro- , nitroso -, azo -, and diazo -compounds, azides , cyanates , thiocyanates , and imino -derivatives find no echo with phosphorus, arsenic, antimony, or bismuth. By the same token, however, the complexity of the phosphorus oxoacids finds no echo with nitrogen. Setting aside their differences, nitrogen and phosphorus form an extensive series of compounds with one another; these have chain, ring, and cage structures. Table of thermal and physical properties of nitrogen (N 2 ) at atmospheric pressure: Nitrogen has two stable isotopes : N and N. The first

7040-660: Is of interest for the preparation of explosives. It is a deliquescent , colourless crystalline solid that is sensitive to light. In the solid state it is ionic with structure [NO 2 ] [NO 3 ] ; as a gas and in solution it is molecular O 2 N–O–NO 2 . Hydration to nitric acid comes readily, as does analogous reaction with hydrogen peroxide giving peroxonitric acid (HOONO 2 ). It is a violent oxidising agent. Gaseous dinitrogen pentoxide decomposes as follows: Many nitrogen oxoacids are known, though most of them are unstable as pure compounds and are known only as aqueous solutions or as salts. Hyponitrous acid (H 2 N 2 O 2 )

7200-546: Is one of three private land-grant universities in the United States, the others being Cornell University and Tuskegee University . The institute has an urban campus that extends more than a mile (1.6 km) alongside the Charles River , and operates off-campus facilities including the MIT Lincoln Laboratory , the Bates Center, and the Haystack Observatory , as well as affiliated laboratories such as

7360-521: Is prepared by passing an electric discharge through nitrogen gas at 0.1–2 mmHg, which produces atomic nitrogen along with a peach-yellow emission that fades slowly as an afterglow for several minutes even after the discharge terminates. Given the great reactivity of atomic nitrogen, elemental nitrogen usually occurs as molecular N 2 , dinitrogen. This molecule is a colourless, odourless, and tasteless diamagnetic gas at standard conditions: it melts at −210 °C and boils at −196 °C. Dinitrogen

7520-443: Is produced from O (in water) via an (n,p) reaction , in which the O atom captures a neutron and expels a proton. It has a short half-life of about 7.1 s, but its decay back to O produces high-energy gamma radiation (5 to 7 MeV). Because of this, access to the primary coolant piping in a pressurised water reactor must be restricted during reactor power operation. It is a sensitive and immediate indicator of leaks from

7680-449: Is sandwiched between two porous electrodes . CO 2 diffuses through the porous electrode ( cathode ) and reaches the vicinity of the electrode-electrolyte boundary. Through a combination of thermal dissociation and electrocatalysis, an oxygen atom is liberated from the CO 2 molecule and picks up two electrons from the cathode to become an oxide ion (O). Via oxygen ion vacancies in

7840-474: Is significant. It is a weak acid with p K a 3.35 at 18 °C. They may be titrimetrically analysed by their oxidation to nitrate by permanganate . They are readily reduced to nitrous oxide and nitric oxide by sulfur dioxide , to hyponitrous acid with tin (II), and to ammonia with hydrogen sulfide . Salts of hydrazinium N 2 H 5 react with nitrous acid to produce azides which further react to give nitrous oxide and nitrogen. Sodium nitrite

8000-482: Is similar to that in nitrogen, but one extra electron is added to a π * antibonding orbital and thus the bond order has been reduced to approximately 2.5; hence dimerisation to O=N–N=O is unfavourable except below the boiling point (where the cis isomer is more stable) because it does not actually increase the total bond order and because the unpaired electron is delocalised across the NO molecule, granting it stability. There

8160-404: Is smaller than those of boron (84 pm) and carbon (76 pm), while it is larger than those of oxygen (66 pm) and fluorine (57 pm). The nitride anion, N , is much larger at 146 pm, similar to that of the oxide (O : 140 pm) and fluoride (F : 133 pm) anions. The first three ionisation energies of nitrogen are 1.402, 2.856, and 4.577 MJ·mol , and the sum of

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8320-459: Is the largest research facility of its kind in the nation. With a cost of US$ 400 million, it is also one of the costliest buildings on campus. The facility also provides state-of-the-art nanoimaging capabilities with vibration damped imaging and metrology suites sitting atop a 5 × 10 ^  lb (2,300,000 kg) slab of concrete underground. Other notable campus facilities include a pressurized wind tunnel for testing aerodynamic research,

8480-470: Is the largest taxpayer in the city, contributing approximately 14% of the city's annual revenues. Holdings include Technology Square , parts of Kendall Square , University Park , and many properties in Cambridgeport and Area 4 neighboring the main campus. The land is held for investment purposes and potential long-term expansion. MIT's School of Architecture , founded in 1865 and now called

8640-523: Is the most important nitrogen radioisotope, being relatively long-lived enough to use in positron emission tomography (PET), although its half-life is still short and thus it must be produced at the venue of the PET, for example in a cyclotron via proton bombardment of O producing N and an alpha particle . The radioisotope N is the dominant radionuclide in the coolant of pressurised water reactors or boiling water reactors during normal operation. It

8800-400: Is the simplest stable molecule with an odd number of electrons. In mammals, including humans, it is an important cellular signalling molecule involved in many physiological and pathological processes. It is formed by catalytic oxidation of ammonia. It is a colourless paramagnetic gas that, being thermodynamically unstable, decomposes to nitrogen and oxygen gas at 1100–1200 °C. Its bonding

8960-476: Is the strongest π donor known among ligands (the second-strongest is O ). Nitrido complexes are generally made by the thermal decomposition of azides or by deprotonating ammonia, and they usually involve a terminal {≡N} group. The linear azide anion ( N 3 ), being isoelectronic with nitrous oxide , carbon dioxide , and cyanate , forms many coordination complexes. Further catenation is rare, although N 4 (isoelectronic with carbonate and nitrate )

9120-640: Is thermodynamically stable, and most readily produced by the electrolysis of molten ammonium fluoride dissolved in anhydrous hydrogen fluoride . Like carbon tetrafluoride , it is not at all reactive and is stable in water or dilute aqueous acids or alkalis. Only when heated does it act as a fluorinating agent, and it reacts with copper , arsenic, antimony, and bismuth on contact at high temperatures to give tetrafluorohydrazine (N 2 F 4 ). The cations NF 4 and N 2 F 3 are also known (the latter from reacting tetrafluorohydrazine with strong fluoride-acceptors such as arsenic pentafluoride ), as

9280-506: Is usually produced from air by pressure swing adsorption technology. About 2/3 of commercially produced elemental nitrogen is used as an inert (oxygen-free) gas for commercial uses such as food packaging, and much of the rest is used as liquid nitrogen in cryogenic applications. Many industrially important compounds, such as ammonia , nitric acid, organic nitrates ( propellants and explosives ), and cyanides , contain nitrogen. The extremely strong triple bond in elemental nitrogen (N≡N),

9440-403: Is widely conceived as basically a vocational school", a "partly unjustified" perception the committee sought to change. The report comprehensively reviewed the undergraduate curriculum, recommended offering a broader education, and warned against letting engineering and government-sponsored research detract from the sciences and humanities. The School of Humanities, Arts, and Social Sciences and

9600-580: The Artificial Intelligence Laboratory , and the Tech Model Railroad Club wrote some of the earliest interactive computer video games like Spacewar! and created much of modern hacker slang and culture. Several major computer-related organizations have originated at MIT since the 1980s: Richard Stallman 's GNU Project and the subsequent Free Software Foundation were founded in the mid-1980s at

9760-547: The Boston Marathon bombing of April 2013, MIT Police patrol officer Sean Collier was fatally shot by the suspects Dzhokhar and Tamerlan Tsarnaev , setting off a violent manhunt that shut down the campus and much of the Boston metropolitan area for a day. One week later, Collier's memorial service was attended by more than 10,000 people, in a ceremony hosted by the MIT community with thousands of police officers from

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9920-479: The Broad and Whitehead Institutes . As of October 2024 , 105 Nobel laureates , 26 Turing Award winners, and 8 Fields Medalists have been affiliated with MIT as alumni, faculty members, or researchers. In addition, 58 National Medal of Science recipients, 29 National Medals of Technology and Innovation recipients, 50 MacArthur Fellows , 83 Marshall Scholars , 41 astronauts , 16 Chief Scientists of

10080-587: The German research university model , emphasizing an independent faculty engaged in research, as well as instruction oriented around seminars and laboratories. Two days after MIT was chartered, the first battle of the Civil War broke out. After a long delay through the war years, MIT's first classes were held in the Mercantile Building in Boston in 1865. The new institute was founded as part of

10240-512: The Greek word άζωτικός (azotikos), "no life", due to it being asphyxiant . In an atmosphere of pure nitrogen, animals died and flames were extinguished. Though Lavoisier's name was not accepted in English since it was pointed out that all gases but oxygen are either asphyxiant or outright toxic, it is used in many languages (French, Italian, Portuguese, Polish, Russian, Albanian, Turkish, etc.;

10400-508: The MIT Sloan School of Management were formed in 1950 to compete with the powerful Schools of Science and Engineering . Previously marginalized faculties in the areas of economics, management, political science, and linguistics emerged into cohesive and assertive departments by attracting respected professors and launching competitive graduate programs. The School of Humanities, Arts, and Social Sciences continued to develop under

10560-700: The Morrill Land-Grant Colleges Act to fund institutions "to promote the liberal and practical education of the industrial classes" and was a land-grant school. In 1863 under the same act, the Commonwealth of Massachusetts founded the Massachusetts Agricultural College , which developed as the University of Massachusetts Amherst . In 1866, the proceeds from land sales went toward new buildings in

10720-564: The Niels Bohr Institute at the University of Copenhagen , Arizona State University , and the Technical University of Denmark . MOXIE acquires, compresses, and heats Martian atmospheric gases using a HEPA filter , scroll compressor , and heaters alongside insulation, then splits the carbon dioxide ( CO 2 ) molecules into oxygen (O) and carbon monoxide (CO) using solid oxide electrolysis , where

10880-554: The One Laptop per Child initiative to expand computer education and connectivity to children worldwide was launched in 2005. MIT was named a sea-grant college in 1976 to support its programs in oceanography and marine sciences and was named a space-grant college in 1989 to support its aeronautics and astronautics programs. Despite diminishing government financial support over the past quarter century, MIT launched several successful development campaigns to significantly expand

11040-435: The anhydride of hyponitrous acid (H 2 N 2 O 2 ) because that acid is not produced by the dissolution of nitrous oxide in water. It is rather unreactive (not reacting with the halogens, the alkali metals, or ozone at room temperature, although reactivity increases upon heating) and has the unsymmetrical structure N–N–O (N≡N O ↔ N=N =O): above 600 °C it dissociates by breaking the weaker N–O bond. Nitric oxide (NO)

11200-476: The eutrophication of water systems. Apart from its use in fertilisers and energy stores, nitrogen is a constituent of organic compounds as diverse as aramids used in high-strength fabric and cyanoacrylate used in superglue . Nitrogen occurs in all organisms, primarily in amino acids (and thus proteins ), in the nucleic acids ( DNA and RNA ) and in the energy transfer molecule adenosine triphosphate . The human body contains about 3% nitrogen by mass,

11360-546: The governor of Massachusetts , on April 10, 1861. Rogers, who was educated at the College of William & Mary and later held professorships at both William & Mary and the University of Virginia , wanted to establish an institution to address rapid scientific and technological advances. He did not wish to found a professional school , but a combination with elements of both professional and liberal education , proposing that: The true and only practicable object of

11520-467: The "Technology Plan" in 1920. As MIT grew under the Tech Plan, it built new postgraduate programs that stressed laboratory work on industry problems, including a new program in electrical engineering. Gerard Swope , MIT's chairman and head of General Electric , believed talented engineers needed scientific research training. In 1930, he recruited Karl Taylor Compton to helm MIT's transformation as

11680-510: The 1980s, there was more controversy at MIT over its involvement in SDI (space weaponry) and CBW (chemical and biological warfare) research. More recently, MIT's research for the military has included work on robots, drones and 'battle suits'. MIT has kept pace with and helped to advance the digital age. In addition to developing the predecessors to modern computing and networking technologies, students, staff, and faculty members at Project MAC ,

11840-566: The 2s and 2p orbitals, three of which (the p-electrons) are unpaired. It has one of the highest electronegativities among the elements (3.04 on the Pauling scale), exceeded only by chlorine (3.16), oxygen (3.44), and fluorine (3.98). (The light noble gases , helium , neon , and argon , would presumably also be more electronegative, and in fact are on the Allen scale.) Following periodic trends, its single-bond covalent radius of 71 pm

12000-742: The AI Lab; the MIT Media Lab was founded in 1985 by Nicholas Negroponte and Jerome Wiesner to promote research into novel uses of computer technology; the World Wide Web Consortium standards organization was founded at the Laboratory for Computer Science in 1994 by Tim Berners-Lee ; the OpenCourseWare project has made course materials for over 2,000 MIT classes available online free of charge since 2002; and

12160-556: The Back Bay. MIT was informally called "Boston Tech". The institute adopted the European polytechnic university model and emphasized laboratory instruction from an early date. Despite chronic financial problems, the institute saw growth in the last two decades of the 19th century under President Francis Amasa Walker . Programs in electrical, chemical, marine, and sanitary engineering were introduced, new buildings were built, and

12320-568: The Boston area's classical architecture and serve as examples of contemporary campus " starchitecture ". These buildings have not always been well received; in 2010, The Princeton Review included MIT in a list of twenty schools whose campuses are "tiny, unsightly, or both". Undergraduates are guaranteed four-year housing in one of MIT's 11 undergraduate dormitories. Those living on campus can receive support and mentoring from live-in graduate student tutors, resident advisors, and faculty housemasters. Because housing assignments are made based on

12480-633: The French nitrogène , coined in 1790 by French chemist Jean-Antoine Chaptal (1756–1832), from the French nitre ( potassium nitrate , also called saltpetre ) and the French suffix -gène , "producing", from the Greek -γενής (-genes, "begotten"). Chaptal's meaning was that nitrogen is the essential part of nitric acid , which in turn was produced from nitre . In earlier times, nitre had been confused with Egyptian "natron" ( sodium carbonate ) – called νίτρον (nitron) in Greek ;– which, despite

12640-535: The German Stickstoff similarly refers to the same characteristic, viz. ersticken "to choke or suffocate") and still remains in English in the common names of many nitrogen compounds, such as hydrazine and compounds of the azide ion. Finally, it led to the name " pnictogens " for the group headed by nitrogen, from the Greek πνίγειν "to choke". The English word nitrogen (1794) entered the language from

12800-611: The Institute to develop leadership in science as well as in engineering". Unlike Ivy League schools, MIT catered more to middle-class families, and depended more on tuition than on endowments or grants for its funding. The school was elected to the Association of American Universities in 1934. Still, as late as 1949, the Lewis Committee lamented in its report on the state of education at MIT that "the Institute

12960-514: The LIGO detector and the observation of gravitational waves, two Caltech physicists, Kip Thorne and Barry Barish , and MIT physicist Rainer Weiss won the Nobel Prize in physics in 2017. Weiss, who is also an MIT graduate, designed the laser interferometric technique, which served as the essential blueprint for the LIGO. In April of 2024, MIT students joined other campuses across

13120-528: The MIT Investment Management Company (MITIMCo), a subsidiary of the MIT Corporation created in 2004. A minor revenue source for much of the Institute's history, the endowment's role in MIT operations has grown due to strong investment returns since the 1990s, making it one the largest endowments held by American universities . Among its holdings are a majority of shares in the audio equipment manufacturer Bose Corporation . MIT

13280-628: The Massachusetts Institute of Technology, Acts of 1861, Chapter 183 In 1859, a proposal was submitted to the Massachusetts General Court to use newly filled lands in Back Bay , Boston for a " Conservatory of Art and Science ", but the proposal failed. A charter for the incorporation of the Massachusetts Institute of Technology, proposed by William Barton Rogers , was signed by John Albion Andrew ,

13440-638: The Media Lab, the Sloan School's eastern campus, and graduate residences in the northwest. In 2006, President Hockfield launched the MIT Energy Research Council to investigate the interdisciplinary challenges posed by increasing global energy consumption . In 2001, inspired by the open source and open access movements , MIT launched OpenCourseWare to make the lecture notes, problem sets , syllabi, exams, and lectures from

13600-744: The Middle Ages. Alchemists knew nitric acid as aqua fortis (strong water), as well as other nitrogen compounds such as ammonium salts and nitrate salts. The mixture of nitric and hydrochloric acids was known as aqua regia (royal water), celebrated for its ability to dissolve gold , the king of metals. The discovery of nitrogen is attributed to the Scottish physician Daniel Rutherford in 1772, who called it noxious air . Though he did not recognise it as an entirely different chemical substance, he clearly distinguished it from Joseph Black's "fixed air" , or carbon dioxide. The fact that there

13760-860: The N anion, although charge separation is not actually complete even for these highly electropositive elements. However, the alkali metal azides NaN 3 and KN 3 , featuring the linear N 3 anion, are well-known, as are Sr(N 3 ) 2 and Ba(N 3 ) 2 . Azides of the B-subgroup metals (those in groups 11 through 16 ) are much less ionic, have more complicated structures, and detonate readily when shocked. Many covalent binary nitrides are known. Examples include cyanogen ((CN) 2 ), triphosphorus pentanitride (P 3 N 5 ), disulfur dinitride (S 2 N 2 ), and tetrasulfur tetranitride (S 4 N 4 ). The essentially covalent silicon nitride (Si 3 N 4 ) and germanium nitride (Ge 3 N 4 ) are also known: silicon nitride, in particular, would make

13920-535: The New England region and Canada. On November 25, 2013, MIT announced the creation of the Collier Medal, to be awarded annually to "an individual or group that embodies the character and qualities that Officer Collier exhibited as a member of the MIT community and in all aspects of his life". The announcement further stated that "Future recipients of the award will include those whose contributions exceed

14080-450: The N≡N bond may be formed directly within a metal complex, for example by directly reacting coordinated ammonia (NH 3 ) with nitrous acid (HNO 2 ), but this is not generally applicable. Most dinitrogen complexes have colours within the range white-yellow-orange-red-brown; a few exceptions are known, such as the blue [{Ti( η -C 5 H 5 ) 2 } 2 -(N 2 )]. Nitrogen bonds to almost all

14240-411: The O atoms combine to form gaseous oxygen ( O 2 ). The conversion process requires a temperature of approximately 800 °C (1,470 °F). A solid oxide electrolysis cell works on the principle that, at elevated temperatures, certain ceramic oxides, such as yttria-stabilized zirconia (YSZ) and doped ceria , become oxide ion (O) conductors . A thin nonporous disk of YSZ (solid electrolyte)

14400-523: The School of Architecture and Planning, was the first formal architecture program in the United States, and it has a history of commissioning progressive buildings. The first buildings constructed on the Cambridge campus, completed in 1916, are sometimes called the "Maclaurin buildings" after Institute president Richard Maclaurin who oversaw their construction. Designed by William Welles Bosworth , these imposing buildings were built of reinforced concrete ,

14560-538: The US Air Force , and 1 foreign head of state have been affiliated with MIT. The institute also has a strong entrepreneurial culture and MIT alumni have founded or co-founded many notable companies. MIT is a member of the Association of American Universities . [...] a school of industrial science aiding the advancement, development and practical application of science in connection with arts, agriculture, manufactures, and commerce [...] Act to Incorporate

14720-643: The United States in protests and setting up encampments against the Israel–Hamas war . Student likened their actions to the historic protests against the American invasion of  Vietnam and MIT investment’s in South African apartheid ; they called for ending ties to the Israeli Ministry of Defense . MIT's 166-acre (67.2 ha) campus in the city of Cambridge spans approximately

14880-418: The ability to form coordination complexes by donating its lone pairs of electrons. There are some parallels between the chemistry of ammonia NH 3 and water H 2 O. For example, the capacity of both compounds to be protonated to give NH 4 and H 3 O or deprotonated to give NH 2 and OH , with all of these able to be isolated in solid compounds. Nitrogen shares with both its horizontal neighbours

15040-408: The arts and sciences. In 2010, it was dubbed "most selective" by U.S. News , admitting few transfer students and 4.1% of its applicants in the 2020–2021 admissions cycle. It is need-blind for both domestic and international applicants. MIT offers 44 undergraduate degrees across its five schools. In the 2017–2018 academic year, 1,045 Bachelor of Science degrees (abbreviated " SB ") were granted,

15200-417: The atmosphere. The N: N ratio is commonly used in stable isotope analysis in the fields of geochemistry , hydrology , paleoclimatology and paleoceanography , where it is called δ N . Of the thirteen other isotopes produced synthetically, ranging from N to N, N has a half-life of ten minutes and the remaining isotopes have half-lives less than eight seconds. Given the half-life difference, N

15360-435: The beta hexagonal close-packed crystal allotropic form. Below 35.4 K (−237.6 °C) nitrogen assumes the cubic crystal allotropic form (called the alpha phase). Liquid nitrogen , a colourless fluid resembling water in appearance, but with 80.8% of the density (the density of liquid nitrogen at its boiling point is 0.808 g/mL), is a common cryogen . Solid nitrogen has many crystalline modifications. It forms

15520-540: The boundaries of their profession, those who have contributed to building bridges across the community, and those who consistently and selflessly perform acts of kindness". In September 2017, the school announced the creation of an artificial intelligence research lab called the MIT-IBM Watson AI Lab. IBM will spend $ 240 million over the next decade, and the lab will be staffed by MIT and IBM scientists. In October 2018 MIT announced that it would open

15680-734: The budget, new programs, degrees and faculty appointments, and elects a president to manage the university and preside over the Institute's faculty. The current president is Sally Kornbluth , a cell biologist and former provost at Duke University , who became MIT's eighteenth president in January 2023. MIT has five schools ( Science , Engineering , Architecture and Planning , Management , and Humanities, Arts, and Social Sciences ) and one college ( Schwarzman College of Computing ), but no schools of law or medicine. While faculty committees assert substantial control over many areas of MIT's curriculum, research, student life, and administrative affairs,

15840-636: The campus, the Institute has also extensively renovated existing buildings to improve their energy efficiency. MIT has also taken steps to reduce its environmental impact by running alternative fuel campus shuttles, subsidizing public transportation passes , constructing solar power offsets , and building a cogeneration plant to power campus electricity, heating, and cooling requirements. MIT has substantial commercial real estate holdings in Cambridge on which it pays property taxes , plus an additional voluntary payment in lieu of taxes (PILOT) on academic buildings which are legally tax-exempt. As of 2017 , it

16000-549: The campus: new dormitories and athletics buildings on west campus; the Tang Center for Management Education ; several buildings in the northeast corner of campus supporting research into biology , brain and cognitive sciences , genomics , biotechnology , and cancer research ; and a number of new "backlot" buildings on Vassar Street including the Stata Center . Construction on campus in the 2000s included expansions of

16160-551: The chair of each of MIT's 32 academic departments reports to the dean of that department's school, who in turn reports to the Provost under the President. Academic departments are also evaluated by "Visiting Committees," specialized bodies of Corporation members and outside experts who review the performance, activities, and needs of each department. MIT's endowment , real estate, and other financial assets are managed through by

16320-416: The conjugate acid of the azide anion, and is similarly analogous to the hydrohalic acids . All four simple nitrogen trihalides are known. A few mixed halides and hydrohalides are known, but are mostly unstable; examples include NClF 2 , NCl 2 F, NBrF 2 , NF 2 H, NFH 2 , NCl 2 H , and NClH 2 . Nitrogen trifluoride (NF 3 , first prepared in 1928) is a colourless and odourless gas that

16480-555: The continuity of bonding types instead of the discrete and separate types that it implies. They are normally prepared by directly reacting a metal with nitrogen or ammonia (sometimes after heating), or by thermal decomposition of metal amides: Many variants on these processes are possible. The most ionic of these nitrides are those of the alkali metals and alkaline earth metals , Li 3 N (Na, K, Rb, and Cs do not form stable nitrides for steric reasons) and M 3 N 2 (M = Be, Mg, Ca, Sr, Ba). These can formally be thought of as salts of

16640-491: The country gathered at MIT's Radiation Laboratory , established in 1940 to assist the British military in developing microwave radar . The work done there significantly affected both the war and subsequent research in the area. Other defense projects included gyroscope -based and other complex control systems for gunsight , bombsight , and inertial navigation under Charles Stark Draper 's Instrumentation Laboratory ;

16800-534: The crystal lattice of the electrolyte, the oxygen ion is transported to the electrolyte–anode interface due to the applied DC potential. At this interface, the oxygen ion transfers its charge to the anode , combines with another oxygen atom to form oxygen ( O 2 ), and diffuses out of the anode. The net reaction was thus 2 CO 2 ⟶ {\displaystyle \longrightarrow } 2 CO + O 2 . Inert gases such as nitrogen gas ( N 2 ) and argon (Ar) are not separated from

16960-417: The destruction of hydrazine by reaction with monochloramine (NH 2 Cl) to produce ammonium chloride and nitrogen. Hydrogen azide (HN 3 ) was first produced in 1890 by the oxidation of aqueous hydrazine by nitrous acid. It is very explosive and even dilute solutions can be dangerous. It has a disagreeable and irritating smell and is a potentially lethal (but not cumulative) poison. It may be considered

17120-691: The development of a digital computer for flight simulations under Project Whirlwind ; and high-speed and high-altitude photography under Harold Edgerton . By the end of the war, MIT became the nation's largest wartime R&D contractor (attracting some criticism of Bush), employing nearly 4000 in the Radiation Laboratory alone and receiving in excess of $ 100 million ($ 1.2 billion in 2015 dollars) before 1946. Work on defense projects continued even after then. Post-war government-sponsored research at MIT included SAGE and guidance systems for ballistic missiles and Project Apollo . ...

17280-553: The dormitory system starting in 2002. Because FSILGs had previously housed as many as 300 freshmen off-campus, the new policy could not be implemented until Simmons Hall opened in that year. In 2013–2014, MIT abruptly closed and then demolished undergrad dorm Bexley Hall, citing extensive water damage that made repairs infeasible. In 2017, MIT shut down Senior House after a century of service as an undergrad dorm. That year, MIT administrators released data showing just 60% of Senior House residents had graduated in four years. Campus-wide,

17440-734: The elements in the periodic table except the first two noble gases , helium and neon , and some of the very short-lived elements after bismuth , creating an immense variety of binary compounds with varying properties and applications. Many binary compounds are known: with the exception of the nitrogen hydrides, oxides, and fluorides, these are typically called nitrides . Many stoichiometric phases are usually present for most elements (e.g. MnN, Mn 6 N 5 , Mn 3 N 2 , Mn 2 N, Mn 4 N, and Mn x N for 9.2 < x < 25.3). They may be classified as "salt-like" (mostly ionic), covalent, "diamond-like", and metallic (or interstitial ), although this classification has limitations generally stemming from

17600-467: The equilibrium between them, although sometimes dinitrogen tetroxide can react by heterolytic fission to nitrosonium and nitrate in a medium with high dielectric constant. Nitrogen dioxide is an acrid, corrosive brown gas. Both compounds may be easily prepared by decomposing a dry metal nitrate. Both react with water to form nitric acid . Dinitrogen tetroxide is very useful for the preparation of anhydrous metal nitrates and nitrato complexes, and it became

17760-560: The expanding university. By the 1950s, MIT no longer simply benefited the industries with which it had worked for three decades, and it had developed closer working relationships with new patrons, philanthropic foundations and the federal government. In late 1960s and early 1970s, student and faculty activists protested against the Vietnam War and MIT's defense research. In this period MIT's various departments were researching helicopters, smart bombs and counterinsurgency techniques for

17920-545: The feed, but returned to the atmosphere with the carbon monoxide (CO) and unused CO 2 . Oxygen production was first achieved on April 20, 2021, in Jezero Crater , producing 5.37 grams (0.189 oz) of oxygen, equivalent to what an astronaut on Mars would need to breathe for roughly 10 minutes. MOXIE was designed to safely generate up to 10 g/h (0.35 oz/h) of oxygen, with theoretical production limited to 12 grams per hour (0.42 oz/h) of oxygen due to

18080-474: The first academic buildings complete, the MIT administration and the MIT charter crossed the Charles River on the ceremonial barge Bucentaur built for the occasion. Institute faculty continued to debate whether the Institute education should continue to emphasize "hands on" industrial training or scientific research. Needing funds to match Eastman's gift and cover retreating state support, President Richard MacLaurin launched an industry funding model known as

18240-421: The first gases to be identified: N 2 O ( nitrous oxide ), NO ( nitric oxide ), N 2 O 3 ( dinitrogen trioxide ), NO 2 ( nitrogen dioxide ), N 2 O 4 ( dinitrogen tetroxide ), N 2 O 5 ( dinitrogen pentoxide ), N 4 O ( nitrosylazide ), and N(NO 2 ) 3 ( trinitramide ). All are thermally unstable towards decomposition to their elements. One other possible oxide that has not yet been synthesised

18400-548: The four-year graduation rate is 84% (the cumulative graduation rate is significantly higher). MIT is a publicly-chartered nonprofit corporation governed by a privately appointed board known as the MIT Corporation . A large board since MIT's founding, the Corporation has 60–80 members at any time, some with fixed terms, some with life appointments, and eight who serve ex officio . The Corporation approves

18560-496: The fourth and fifth is 16.920 MJ·mol . Due to these very high figures, nitrogen has no simple cationic chemistry. The lack of radial nodes in the 2p subshell is directly responsible for many of the anomalous properties of the first row of the p-block , especially in nitrogen, oxygen, and fluorine. The 2p subshell is very small and has a very similar radius to the 2s shell, facilitating orbital hybridisation . It also results in very large electrostatic forces of attraction between

18720-422: The fourth most abundant element in the body after oxygen, carbon, and hydrogen. The nitrogen cycle describes the movement of the element from the air, into the biosphere and organic compounds, then back into the atmosphere. Nitrogen is a constituent of every major pharmacological drug class, including antibiotics . Many drugs are mimics or prodrugs of natural nitrogen-containing signal molecules : for example,

18880-641: The great majority of its courses available online for no charge, though without any formal accreditation for coursework completed. While the cost of supporting and hosting the project is high, OCW expanded in 2005 to include other universities as a part of the OpenCourseWare Consortium, which currently includes more than 250 academic institutions with content available in at least six languages. In 2011, MIT announced it would offer formal certification (but not credits or degrees) to online participants completing coursework in its "MITx" program, for

19040-437: The head of group 15 in the periodic table, its chemistry shows huge differences from that of its heavier congeners phosphorus , arsenic , antimony , and bismuth . Nitrogen may be usefully compared to its horizontal neighbours' carbon and oxygen as well as its vertical neighbours in the pnictogen column, phosphorus, arsenic, antimony, and bismuth. Although each period 2 element from lithium to oxygen shows some similarities to

19200-486: The instrument – at 98% purity or better. On its 16th and final run, on August 7, 2023, the instrument made 9.8 g (0.35 oz) of oxygen. MOXIE successfully completed all of its technical requirements and was operated at a variety of conditions throughout a full Mars year, allowing the instrument’s developers to learn a great deal about the technology. NASA states that if MOXIE worked efficiently, they could land an approximately 200-times larger, MOXIE-based instrument on

19360-505: The interstitial nitrides of formulae MN, M 2 N, and M 4 N (although variable composition is perfectly possible), where the small nitrogen atoms are positioned in the gaps in a metallic cubic or hexagonal close-packed lattice. They are opaque, very hard, and chemically inert, melting only at very high temperatures (generally over 2500 °C). They have a metallic lustre and conduct electricity as do metals. They hydrolyse only very slowly to give ammonia or nitrogen. The nitride anion (N )

19520-455: The limited capacity of the 4 ampere flight power supply. The oxygen produced was analyzed, and then released back into the atmosphere. MOXIE was used to isolate oxygen a further nine more times over the course of approximately two Earth years, or one Martian year, in three stages; the first stage will further investigate the oxygen production, the second to test the instrument in a variety of times of day, seasons, and atmospheric conditions, and

19680-548: The men participated in fraternities and 20% of the women were involved in sororities. Most FSILGs are located across the river in Back Bay near where MIT was founded, and there is also a cluster of fraternities on MIT's West Campus that face the Charles River Basin. After the 1997 alcohol-related death of Scott Krueger, a new pledge at the Phi Gamma Delta fraternity, MIT required all freshmen to live in

19840-446: The most popular department, collectively identify themselves as "Course 6". MIT students use a combination of the department's course number and the number assigned to the class to identify their subjects; for instance, the introductory calculus-based classical mechanics course is simply "8.01" (pronounced eight-oh-one ) at MIT. The four-year, full-time undergraduate program maintains a balance between professional majors and those in

20000-439: The most powerful university-based nuclear reactors in the United States. The prominence of the reactor's containment building in a densely populated area has been controversial, but MIT maintains that it is well-secured. MIT Nano, also known as Building 12, is an interdisciplinary facility for nanoscale research. Its 100,000 sq ft (9,300 m ) cleanroom and research space, visible through expansive glass facades,

20160-525: The name, contained no nitrate. The earliest military, industrial, and agricultural applications of nitrogen compounds used saltpetre ( sodium nitrate or potassium nitrate), most notably in gunpowder , and later as fertiliser . In 1910, Lord Rayleigh discovered that an electrical discharge in nitrogen gas produced "active nitrogen", a monatomic allotrope of nitrogen. The "whirling cloud of brilliant yellow light" produced by his apparatus reacted with mercury to produce explosive mercury nitride . For

20320-702: The names of important scientists and philosophers. The spacious Building 7 atrium at 77 Massachusetts Avenue is regarded as the entrance to the Infinite Corridor and the rest of the campus. Alvar Aalto 's Baker House (1947), Eero Saarinen 's MIT Chapel and Kresge Auditorium (1955), and I.M. Pei 's Green , Dreyfus, Landau, and Wiesner buildings represent high forms of post-war modernist architecture . More recent buildings like Frank Gehry 's Stata Center (2004), Steven Holl 's Simmons Hall (2002), Charles Correa 's Building 46 (2005), and Fumihiko Maki 's Media Lab Extension (2009) stand out among

20480-574: The nitryl halides (XNO 2 ). The first is very reactive gases that can be made by directly halogenating nitrous oxide. Nitrosyl fluoride (NOF) is colourless and a vigorous fluorinating agent. Nitrosyl chloride (NOCl) behaves in much the same way and has often been used as an ionising solvent. Nitrosyl bromide (NOBr) is red. The reactions of the nitryl halides are mostly similar: nitryl fluoride (FNO 2 ) and nitryl chloride (ClNO 2 ) are likewise reactive gases and vigorous halogenating agents. Nitrogen forms nine molecular oxides, some of which were

20640-436: The nucleus and the valence electrons in the 2s and 2p shells, resulting in very high electronegativities. Hypervalency is almost unknown in the 2p elements for the same reason, because the high electronegativity makes it difficult for a small nitrogen atom to be a central atom in an electron-rich three-center four-electron bond since it would tend to attract the electrons strongly to itself. Thus, despite nitrogen's position at

20800-778: The only type of undergraduate degree MIT now awards. In the 2011 fall term, among students who had designated a major, the School of Engineering was the most popular division, enrolling 63% of students in its 19 degree programs, followed by the School of Science (29%), School of Humanities, Arts, & Social Sciences (3.7%), Sloan School of Management (3.3%), and School of Architecture and Planning (2%). The largest undergraduate degree programs were in Electrical Engineering and Computer Science ( Course 6–2 ), Computer Science and Engineering ( Course 6–3 ), Mechanical Engineering ( Course 2 ), Physics ( Course 8 ), and Mathematics ( Course 18 ). Nitrogen gas Nitrogen

20960-399: The order in which the buildings were built and their location relative (north, west, and east) to the original center cluster of Maclaurin buildings. Many of the buildings are connected above ground as well as through an extensive network of tunnels, providing protection from the Cambridge weather as well as a venue for roof and tunnel hacking . MIT's on-campus nuclear reactor is one of

21120-410: The organic nitrates nitroglycerin and nitroprusside control blood pressure by metabolising into nitric oxide . Many notable nitrogen-containing drugs, such as the natural caffeine and morphine or the synthetic amphetamines , act on receptors of animal neurotransmitters . Nitrogen compounds have a very long history, ammonium chloride having been known to Herodotus . They were well-known by

21280-412: The other four are H , Li, B, and Ta. The relative abundance of N and N is practically constant in the atmosphere but can vary elsewhere, due to natural isotopic fractionation from biological redox reactions and the evaporation of natural ammonia or nitric acid . Biologically mediated reactions (e.g., assimilation , nitrification , and denitrification ) strongly control nitrogen dynamics in

21440-421: The other nonmetals are very complex and tend to lead to a mixture of products. Ammonia reacts on heating with metals to give nitrides. Many other binary nitrogen hydrides are known, but the most important are hydrazine (N 2 H 4 ) and hydrogen azide (HN 3 ). Although it is not a nitrogen hydride, hydroxylamine (NH 2 OH) is similar in properties and structure to ammonia and hydrazine as well. Hydrazine

21600-478: The oxidation of ammonia to nitrite, which occurs in the nitrogen cycle . Hyponitrite can act as a bridging or chelating bidentate ligand. Nitrous acid (HNO 2 ) is not known as a pure compound, but is a common component in gaseous equilibria and is an important aqueous reagent: its aqueous solutions may be made from acidifying cool aqueous nitrite ( NO 2 , bent) solutions, although already at room temperature disproportionation to nitrate and nitric oxide

21760-556: The pace of life at the Institute" to match the return to peacetime, remembering the "academic tranquility of the prewar years", though acknowledging the significant contributions of military research to the increased emphasis on graduate education and rapid growth of personnel and facilities. The faculty doubled and the graduate student body quintupled during the presidential terms of Karl Taylor Compton (1930–1948), James Rhyne Killian (1948–1957), and chancellor Julius Adams Stratton (1952–1957), whose institution-building strategies shaped

21920-704: The period 3 element in the next group (from magnesium to chlorine; these are known as diagonal relationships ), their degree drops off abruptly past the boron–silicon pair. The similarities of nitrogen to sulfur are mostly limited to sulfur nitride ring compounds when both elements are the only ones present. Nitrogen does not share the proclivity of carbon for catenation . Like carbon, nitrogen tends to form ionic or metallic compounds with metals. Nitrogen forms an extensive series of nitrides with carbon, including those with chain-, graphitic- , and fullerenic -like structures. It resembles oxygen with its high electronegativity and concomitant capability for hydrogen bonding and

22080-405: The planet, along with a power plant capable of generating 25–30 kilowatts (34–40 hp). Over the course of approximately one Earth year, this system would produce oxygen at a rate of at least 2 kilograms per hour (4.4 lb/h) in support of a human mission sometime in the 2030s. The stored oxygen could be used for life support, but the primary need is for an oxidizer for a Mars ascent vehicle. It

22240-905: The preferences of the students themselves, diverse social atmospheres can be sustained in different living groups; for example, according to the Yale Daily News staff's The Insider's Guide to the Colleges, 2010 , "The split between East Campus and West Campus is a significant characteristic of MIT. East Campus has gained a reputation as a thriving counterculture." MIT also has 5 dormitories for single graduate students and 2 apartment buildings on campus for married student families. MIT has an active Greek and co-op housing system, including thirty-six fraternities , sororities , and independent living groups ( FSILGs ). As of 2015 , 98% of all undergraduates lived in MIT-affiliated housing; 54% of

22400-583: The primary coolant system to the secondary steam cycle and is the primary means of detection for such leaks. Atomic nitrogen, also known as active nitrogen, is highly reactive, being a triradical with three unpaired electrons. Free nitrogen atoms easily react with most elements to form nitrides, and even when two free nitrogen atoms collide to produce an excited N 2 molecule, they may release so much energy on collision with even such stable molecules as carbon dioxide and water to cause homolytic fission into radicals such as CO and O or OH and H. Atomic nitrogen

22560-522: The production of fertilisers. Dinitrogen is able to coordinate to metals in five different ways. The more well-characterised ways are the end-on M←N≡N ( η ) and M←N≡N→M ( μ , bis- η ), in which the lone pairs on the nitrogen atoms are donated to the metal cation. The less well-characterised ways involve dinitrogen donating electron pairs from the triple bond, either as a bridging ligand to two metal cations ( μ , bis- η ) or to just one ( η ). The fifth and unique method involves triple-coordination as

22720-637: The protests. The student body, faculty, and administration remained comparatively unpolarized during what was a tumultuous time for many other universities. Johnson was seen to be highly successful in leading his institution to "greater strength and unity" after these times of turmoil. However six MIT students were sentenced to prison terms at this time and some former student leaders, such as Michael Albert and George Katsiaficas , are still indignant about MIT's role in military research and its suppression of these protests. ( Richard Leacock 's film, November Actions , records some of these tumultuous events. ) In

22880-583: The same time, use of the Ostwald process (1902) to produce nitrates from industrial nitrogen fixation allowed the large-scale industrial production of nitrates as feedstock in the manufacture of explosives in the World Wars of the 20th century. A nitrogen atom has seven electrons. In the ground state, they are arranged in the electron configuration 1s 2s 2p x 2p y 2p z . It, therefore, has five valence electrons in

23040-557: The same time. The name nitrogène was suggested by French chemist Jean-Antoine-Claude Chaptal in 1790 when it was found that nitrogen was present in nitric acid and nitrates . Antoine Lavoisier suggested instead the name azote , from the Ancient Greek : ἀζωτικός "no life", as it is an asphyxiant gas ; this name is used in a number of languages, and appears in the English names of some nitrogen compounds such as hydrazine , azides and azo compounds . Elemental nitrogen

23200-497: The second strongest bond in any diatomic molecule after carbon monoxide (CO), dominates nitrogen chemistry. This causes difficulty for both organisms and industry in converting N 2 into useful compounds , but at the same time it means that burning, exploding, or decomposing nitrogen compounds to form nitrogen gas releases large amounts of often useful energy. Synthetically produced ammonia and nitrates are key industrial fertilisers , and fertiliser nitrates are key pollutants in

23360-674: The size of the student body increased to more than one thousand. The curriculum drifted to a vocational emphasis, with less focus on theoretical science. The fledgling school still suffered from chronic financial shortages which diverted the attention of the MIT leadership. During these "Boston Tech" years, MIT faculty and alumni rebuffed Harvard University president (and former MIT faculty) Charles W. Eliot 's repeated attempts to merge MIT with Harvard College's Lawrence Scientific School . There would be at least six attempts to absorb MIT into Harvard. In its cramped Back Bay location, MIT could not afford to expand its overcrowded facilities, driving

23520-451: The soil. These reactions typically result in N enrichment of the substrate and depletion of the product . The heavy isotope N was first discovered by S. M. Naudé in 1929, and soon after heavy isotopes of the neighbouring elements oxygen and carbon were discovered. It presents one of the lowest thermal neutron capture cross-sections of all isotopes. It is frequently used in nuclear magnetic resonance (NMR) spectroscopy to determine

23680-451: The spring semester commencing in early February and ceasing in late May. MIT students refer to both their majors and classes using numbers or acronyms alone. Departments and their corresponding majors are numbered in the approximate order of their foundation; for example, Civil and Environmental Engineering is Course 1 , while Linguistics and Philosophy is Course 24 . Students majoring in Electrical Engineering and Computer Science (EECS),

23840-457: The storable oxidiser of choice for many rockets in both the United States and USSR by the late 1950s. This is because it is a hypergolic propellant in combination with a hydrazine -based rocket fuel and can be easily stored since it is liquid at room temperature. The thermally unstable and very reactive dinitrogen pentoxide (N 2 O 5 ) is the anhydride of nitric acid , and can be made from it by dehydration with phosphorus pentoxide . It

24000-489: The structures of nitrogen-containing molecules, due to its fractional nuclear spin of one-half, which offers advantages for NMR such as narrower line width. N, though also theoretically usable, has an integer nuclear spin of one and thus has a quadrupole moment that leads to wider and less useful spectra. N NMR nevertheless has complications not encountered in the more common H and C NMR spectroscopy. The low natural abundance of N (0.36%) significantly reduces sensitivity,

24160-401: The stuff we breathe. Rocket propellant depends on oxygen, and future explorers will depend on producing propellant on Mars to make the trip home." MOXIE had generated a total of 122 g (4.3 oz) of oxygen – about what a small dog breathes in 10 hours. At its most efficient, MOXIE was able to produce 12 grams per hour (0.42 oz/h) of oxygen – twice as much as NASA’s original goals for

24320-427: The successive terms of the more humanistically oriented presidents Howard W. Johnson and Jerome Wiesner between 1966 and 1980. MIT's involvement in military science surged during World War II . In 1941, Vannevar Bush was appointed head of the federal Office of Scientific Research and Development and directed funding to only a select group of universities, including MIT. Engineers and scientists from across

24480-616: The third to produce oxygen at different temperatures, and alter the mode of operation to investigate differences in production. On April 21, 2021, Jim Reuter, the Associate Administrator for STMD explained that the experiment was functioning with results having many uses, stating: "This is a critical first step at converting carbon dioxide to oxygen on Mars. MOXIE has more work to do, but the results from this technology demonstration are full of promise as we move toward our goal of one day seeing humans on Mars. Oxygen isn’t just

24640-420: The touch of a feather, shifting air currents, or even alpha particles . For this reason, small amounts of nitrogen triiodide are sometimes synthesised as a demonstration to high school chemistry students or as an act of "chemical magic". Chlorine azide (ClN 3 ) and bromine azide (BrN 3 ) are extremely sensitive and explosive. Two series of nitrogen oxohalides are known: the nitrosyl halides (XNO) and

24800-588: The war in Vietnam as well as guidance systems for nuclear missiles. The Union of Concerned Scientists was founded on March 4, 1969 during a meeting of faculty members and students seeking to shift the emphasis on military research toward environmental and social problems. MIT ultimately divested itself from the Instrumentation Laboratory and moved all classified research off-campus to the MIT Lincoln Laboratory facility in 1973 in response to

24960-412: Was a component of air that does not support combustion was clear to Rutherford, although he was not aware that it was an element. Nitrogen was also studied at about the same time by Carl Wilhelm Scheele , Henry Cavendish , and Joseph Priestley , who referred to it as burnt air or phlogisticated air . French chemist Antoine Lavoisier referred to nitrogen gas as " mephitic air " or azote , from

25120-937: Was cancelled after the Mars Polar Lander mission failed. The Principal Investigator (PI) of MOXIE was Michael Hecht from the Haystack Observatory at Massachusetts Institute of Technology (MIT). The deputy PI was former NASA astronaut Jeffrey Hoffman from the Department of Aeronautics and Astronautics at MIT. The project manager was Jeff Mellstrom from the NASA/Caltech Jet Propulsion Laboratory (JPL). Along with MIT and JPL, major contributors are OxEon Energy (previously Ceramatec, Inc. ) and Air Squared . Other contributors include Imperial College London , Space Exploration Instruments LLC, Destiny Space Systems LLC,

25280-514: Was designed and constructed by a team of scientists from California Institute of Technology , MIT, and industrial contractors, and funded by the National Science Foundation . It was designed to open the field of gravitational-wave astronomy through the detection of gravitational waves predicted by general relativity . Gravitational waves were detected for the first time by the LIGO detector in 2015. For contributions to

25440-442: Was first found as a product of the thermal decomposition of FN 3 . Nitrogen trichloride (NCl 3 ) is a dense, volatile, and explosive liquid whose physical properties are similar to those of carbon tetrachloride , although one difference is that NCl 3 is easily hydrolysed by water while CCl 4 is not. It was first synthesised in 1811 by Pierre Louis Dulong , who lost three fingers and an eye to its explosive tendencies. As

25600-431: Was projected for example, in a mission of four astronauts on Martian surface for a year, only about 1 metric ton of oxygen would be used for life support for the entire year, compared to about 25 metric tons of oxygen for propulsion off the surface of Mars for the return mission. The CO, a byproduct of the reaction, may be collected and used as a low-grade fuel or reacted with water to form methane ( CH 4 ) for use as

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