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113-593: Asphyxia or asphyxiation is a condition of deficient supply of oxygen to the body which arises from abnormal breathing . Asphyxia causes generalized hypoxia , which affects all the tissues and organs, some more rapidly than others. There are many circumstances that can induce asphyxia, all of which are characterized by the inability of a person to acquire sufficient oxygen through breathing for an extended period of time. Asphyxia can cause coma or death. In 2015, about 9.8 million cases of unintentional suffocation occurred which resulted in 35,600 deaths. The word asphyxia

226-583: A cascade method, Swiss chemist and physicist Raoul Pierre Pictet evaporated liquid sulfur dioxide in order to liquefy carbon dioxide, which in turn was evaporated to cool oxygen gas enough to liquefy it. He sent a telegram on December 22, 1877, to the French Academy of Sciences in Paris announcing his discovery of liquid oxygen . Just two days later, French physicist Louis Paul Cailletet announced his own method of liquefying molecular oxygen. Only

339-401: A heart attack . Koryagin was badly injured during his attempt to prevent more people from going into the crush. Later, both of them were given amnesty. In 1992, on the 10th anniversary of the disaster, and three years after the information about it was revealed to the public, a monument was erected near the site of the tragedy. On 20 October 2007, on the 25th anniversary, a memorial match

452-477: A chemical element. The name oxygen was coined in 1777 by Antoine Lavoisier , who first recognized oxygen as a chemical element and correctly characterized the role it plays in combustion. Common industrial uses of oxygen include production of steel , plastics and textiles , brazing, welding and cutting of steels and other metals , rocket propellant , oxygen therapy , and life support systems in aircraft , submarines , spaceflight and diving . One of

565-434: A few drops of the liquid were produced in each case and no meaningful analysis could be conducted. Oxygen was liquefied in a stable state for the first time on March 29, 1883, by Polish scientists from Jagiellonian University , Zygmunt Wróblewski and Karol Olszewski . In 1891 Scottish chemist James Dewar was able to produce enough liquid oxygen for study. The first commercially viable process for producing liquid oxygen

678-477: A foreign body: Oxygen Oxygen is a chemical element with the symbol   O and atomic number 8. It is a member of the chalcogen group in the periodic table , a highly reactive nonmetal , and a potent oxidizing agent that readily forms oxides with most elements as well as with other compounds . Oxygen is the most abundant element in Earth's crust , and the third-most abundant element in

791-452: A hand over their nose and mouth, while using the other hand to push the victim's jaw up. The corpses had no visible injuries, and were supplied to medical schools for money. Compressive asphyxia (also called chest compression) is mechanically limiting expansion of the lungs by compressing the torso, preventing breathing. " Traumatic asphyxia " or "crush asphyxia" usually refers to compressive asphyxia resulting from being crushed or pinned under

904-405: A hand, pillow, or a plastic bag. Smothering can be either partial or complete, where partial indicates that the person being smothered is able to inhale some air, although less than required. In a normal situation, smothering requires at least partial obstruction of both the nasal cavities and the mouth to lead to asphyxia. Smothering with the hands or chest is used in some combat sports to distract

1017-427: A large weight or force, or in a crowd crush . An example of traumatic asphyxia is a person who jacks up a car to work on it from below, and is crushed by the vehicle when the jack fails. Constrictor snakes such as boa constrictors kill through slow compressive asphyxia, tightening their coils every time the prey breathes out rather than squeezing forcefully. In cases of an adult co-sleeping with an infant ("overlay"),

1130-544: A last-minute goal on the pitch. The Luzhniki stadium has now been awarded the highest (4th) category status by UEFA . It hosted the 2008 UEFA Champions League final and the FIFA World Cup final in 2018 . The only information about the tragedy in the Soviet media immediately after the disaster was a short note in a local daily, Vechernyaya Moskva , the next day. It said: On 20 October 1982, after

1243-481: A light sky-blue color caused by absorption in the red (in contrast with the blue color of the sky, which is due to Rayleigh scattering of blue light). High-purity liquid O 2 is usually obtained by the fractional distillation of liquefied air. Liquid oxygen may also be condensed from air using liquid nitrogen as a coolant. Liquid oxygen is a highly reactive substance and must be segregated from combustible materials. The spectroscopy of molecular oxygen

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1356-419: A low oxygen atmosphere, or in a vacuum; environments where sufficiently oxygenated air is present, but cannot be adequately breathed because of air contamination such as excessive smoke. Other causes of oxygen deficiency include but are not limited to: Smothering is a mechanical obstruction of the flow of air from the environment into the mouth and/or nostrils, for instance, by covering the mouth and nose with

1469-512: A major role in absorbing energy from singlet oxygen and converting it to the unexcited ground state before it can cause harm to tissues. The common allotrope of elemental oxygen on Earth is called dioxygen , O 2 , the major part of the Earth's atmospheric oxygen (see Occurrence ). O 2 has a bond length of 121  pm and a bond energy of 498  kJ/mol . O 2 is used by complex forms of life, such as animals, in cellular respiration . Other aspects of O 2 are covered in

1582-579: A newborn infant long enough to cause apparent harm. It results most commonly from a drop in maternal blood pressure or interference during delivery with blood flow to the infant's brain . This can occur as a result of inadequate circulation or perfusion , impaired respiratory effort, or inadequate ventilation . There has long been a scientific debate over whether newborn infants with asphyxia should be resuscitated with 100% oxygen or normal air. It has been demonstrated that high concentrations of oxygen lead to generation of oxygen free radicals , which have

1695-438: A part of air that he called spiritus nitroaereus . In one experiment, he found that placing either a mouse or a lit candle in a closed container over water caused the water to rise and replace one-fourteenth of the air's volume before extinguishing the subjects. From this, he surmised that nitroaereus is consumed in both respiration and combustion. Mayow observed that antimony increased in weight when heated, and inferred that

1808-404: A process called eutrophication and the decay of these organisms and other biomaterials may reduce the O 2 content in eutrophic water bodies. Scientists assess this aspect of water quality by measuring the water's biochemical oxygen demand , or the amount of O 2 needed to restore it to a normal concentration. Paleoclimatologists measure the ratio of oxygen-18 and oxygen-16 in

1921-462: A role in reperfusion injury after asphyxia. Research by Ola Didrik Saugstad and others led to new international guidelines on newborn resuscitation in 2010, recommending the use of normal air instead of 100% oxygen. Classifications of different forms of asphyxia vary among literature, with differences in defining the concept of mechanical asphyxia being the most obvious. In DiMaio and DiMaio's 2001 textbook on forensic pathology, mechanical asphyxia

2034-537: A similar mechanism are cave-ins , or when an individual is buried in sand, snow, dirt, or grain. In homicidal cases, the term burking is often ascribed to a killing method that involves simultaneous smothering and compression of the torso. The term "burking" comes from the method William Burke and William Hare used to kill their victims during the West Port murders . They killed the usually intoxicated victims by sitting on their chests and suffocating them by putting

2147-458: A small proportion of manganese dioxide. Oxygen levels in the atmosphere are trending slightly downward globally, possibly because of fossil-fuel burning. At standard temperature and pressure , oxygen is a colorless, odorless, and tasteless gas with the molecular formula O 2 , referred to as dioxygen. As dioxygen , two oxygen atoms are chemically bound to each other. The bond can be variously described based on level of theory, but

2260-449: A triplet electronic ground state . An electron configuration with two unpaired electrons, as is found in dioxygen orbitals (see the filled π* orbitals in the diagram) that are of equal energy—i.e., degenerate —is a configuration termed a spin triplet state. Hence, the ground state of the O 2 molecule is referred to as triplet oxygen . The highest-energy, partially filled orbitals are antibonding , and so their filling weakens

2373-445: A weight of approximately 450 kg or 1000 lbs). In cases where people have stacked up on each other in a human pile, it has been estimated that those at the bottom are subjected to around 380 kg (840 lbs) of compressive weight. "Positional" or "restraint" asphyxia is when a person is restrained and left alone prone, such as in a police vehicle, and is unable to reposition themself in order to breathe. The death can be in

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2486-580: Is a corrosive byproduct of smog and thus an air pollutant . Oxygen was isolated by Michael Sendivogius before 1604, but it is commonly believed that the element was discovered independently by Carl Wilhelm Scheele , in Uppsala , in 1773 or earlier, and Joseph Priestley in Wiltshire , in 1774. Priority is often given for Priestley because his work was published first. Priestley, however, called oxygen "dephlogisticated air", and did not recognize it as

2599-477: Is absorbed by specialized respiratory organs called gills , through the skin or via the gut ; in terrestrial animals such as tetrapods , oxygen in air is actively taken into the body via specialized organs known as lungs , where gas exchange takes place to diffuse oxygen into the blood and carbon dioxide out, and the body's circulatory system then transports the oxygen to other tissues where cellular respiration takes place. However in insects ,

2712-513: Is associated with the atmospheric processes of aurora and airglow . The absorption in the Herzberg continuum and Schumann–Runge bands in the ultraviolet produces atomic oxygen that is important in the chemistry of the middle atmosphere. Excited-state singlet molecular oxygen is responsible for red chemiluminescence in solution. Table of thermal and physical properties of oxygen (O 2 ) at atmospheric pressure: Naturally occurring oxygen

2825-528: Is attributed to positional asphyxia. Therefore, passive deaths following custody restraint that are presumed to be the result of positional asphyxia may actually be examples of asphyxia occurring during the restraint process. Chest compression is a technique used in various grappling combat sports, where it is sometimes called wringing, either to tire the opponent or as complementary or distractive moves in combination with pinning holds , or sometimes even as submission holds . Examples of chest compression include

2938-570: Is caused by pressure from outside the body restricting respiration. Similar narrow definitions of mechanical asphyxia have occurred in Azmak's 2006 literature review of asphyxial deaths and Oehmichen and Auer's 2005 book on forensic neuropathology. According to DiMaio and DiMaio, mechanical asphyxia encompasses positional asphyxia, traumatic asphyxia, and "human pile" deaths. In Shkrum and Ramsay's 2007 textbook on forensic pathology, mechanical asphyxia occurs when any mechanical means cause interference with

3051-472: Is composed of three stable isotopes , O , O , and O , with O being the most abundant (99.762% natural abundance ). Most O is synthesized at the end of the helium fusion process in massive stars but some is made in the neon burning process . O is primarily made by the burning of hydrogen into helium during the CNO cycle , making it a common isotope in the hydrogen burning zones of stars. Most O

3164-418: Is from Ancient Greek α- "without" and σφύξις sphyxis , "squeeze" (throb of heart). Situations that can cause asphyxia include but are not limited to: airway obstruction , the constriction or obstruction of airways, such as from asthma , laryngospasm , or simple blockage from the presence of foreign materials; from being in environments where oxygen is not readily accessible: such as underwater, in

3277-447: Is oxygen as a component of water, the major constituent of lifeforms. Oxygen in Earth's atmosphere is produced by biotic photosynthesis , in which photon energy in sunlight is captured by chlorophyll to split water molecules and then react with carbon dioxide to produce carbohydrates and oxygen is released as a byproduct . Oxygen is too chemically reactive to remain a free element in air without being continuously replenished by

3390-441: Is produced when N (made abundant from CNO burning) captures a He nucleus, making O common in the helium-rich zones of evolved, massive stars . Fifteen radioisotopes have been characterized, ranging from O to O. The most stable are O with a half-life of 122.24 seconds and O with a half-life of 70.606 seconds. All of the remaining radioactive isotopes have half-lives that are less than 27 seconds and

3503-408: Is reasonably and simply described as a covalent double bond that results from the filling of molecular orbitals formed from the atomic orbitals of the individual oxygen atoms, the filling of which results in a bond order of two. More specifically, the double bond is the result of sequential, low-to-high energy, or Aufbau , filling of orbitals, and the resulting cancellation of contributions from

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3616-712: Is temperature-dependent, and about twice as much ( 14.6  mg/L ) dissolves at 0 °C than at 20 °C ( 7.6  mg/L ). At 25 °C and 1 standard atmosphere (101.3  kPa ) of air, freshwater can dissolve about 6.04  milliliters  (mL) of oxygen per liter , and seawater contains about 4.95 mL per liter. At 5 °C the solubility increases to 9.0 mL (50% more than at 25 °C) per liter for freshwater and 7.2 mL (45% more) per liter for sea water. Oxygen condenses at 90.20  K (−182.95 °C, −297.31 °F) and freezes at 54.36 K (−218.79 °C, −361.82 °F). Both liquid and solid O 2 are clear substances with

3729-435: Is the result of the oxygen cycle . This biogeochemical cycle describes the movement of oxygen within and between its three main reservoirs on Earth: the atmosphere, the biosphere, and the lithosphere . The main driving factor of the oxygen cycle is photosynthesis , which is responsible for modern Earth's atmosphere. Photosynthesis releases oxygen into the atmosphere, while respiration , decay , and combustion remove it from

3842-463: Is unusual among the planets of the Solar System in having such a high concentration of oxygen gas in its atmosphere: Mars (with 0.1% O 2 by volume) and Venus have much less. The O 2 surrounding those planets is produced solely by the action of ultraviolet radiation on oxygen-containing molecules such as carbon dioxide. The unusually high concentration of oxygen gas on Earth

3955-522: Is usually given priority in the discovery. The French chemist Antoine Laurent Lavoisier later claimed to have discovered the new substance independently. Priestley visited Lavoisier in October 1774 and told him about his experiment and how he liberated the new gas. Scheele had also dispatched a letter to Lavoisier on September 30, 1774, which described his discovery of the previously unknown substance, but Lavoisier never acknowledged receiving it (a copy of

4068-669: The Earth , the Moon , Mars , and meteorites , but were long unable to obtain reference values for the isotope ratios in the Sun , believed to be the same as those of the primordial solar nebula . Analysis of a silicon wafer exposed to the solar wind in space and returned by the crashed Genesis spacecraft has shown that the Sun has a higher proportion of oxygen-16 than does the Earth. The measurement implies that an unknown process depleted oxygen-16 from

4181-463: The Earth's crust in the form of various oxides such as water , carbon dioxide , iron oxides and silicates . All eukaryotic organisms , including plants , animals , fungi , algae and most protists , need oxygen for cellular respiration , which extracts chemical energy by the reaction of oxygen with organic molecules derived from food and releases carbon dioxide as a waste product. In aquatic animals , dissolved oxygen in water

4294-565: The Greek roots ὀξύς (oxys) ( acid , literally 'sharp', from the taste of acids) and -γενής (-genēs) (producer, literally begetter), because he mistakenly believed that oxygen was a constituent of all acids. Chemists (such as Sir Humphry Davy in 1812) eventually determined that Lavoisier was wrong in this regard, but by then the name was too well established. Oxygen entered the English language despite opposition by English scientists and

4407-812: The Hillsborough disaster in 1989, where 97 Liverpool fans were crushed to death in an overcrowded terrace, 95 of the 97 from compressive asphyxia, 93 dying directly from it and 3 others from related complications; the 2021 Meron crowd crush where 45 died; the Astroworld Festival crowd crush in 2021, where 10 died; and the Seoul Halloween crowd crush in 2022, where at least 159 died during Halloween celebrations. In confined spaces, people are forced to push against each other; evidence from bent steel railings in several fatal crowd accidents has shown horizontal forces over 4500 N (equivalent to

4520-464: The knee-on-stomach position ; or techniques such as leg scissors (also referred to as body scissors and in budō referred to as do-jime ; 胴絞, "trunk strangle" or "body triangle") where a participant wraps his or her legs around the opponent's midsection and squeezes them together. Pressing is a form of torture or execution using compressive asphyxia. Perinatal asphyxia is the medical condition resulting from deprivation of oxygen ( hypoxia ) to

4633-470: The shells and skeletons of marine organisms to determine the climate millions of years ago (see oxygen isotope ratio cycle ). Seawater molecules that contain the lighter isotope , oxygen-16, evaporate at a slightly faster rate than water molecules containing the 12% heavier oxygen-18, and this disparity increases at lower temperatures. During periods of lower global temperatures, snow and rain from that evaporated water tends to be higher in oxygen-16, and

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4746-430: The thermal decomposition of potassium nitrate . In Bugaj's view, the isolation of oxygen and the proper association of the substance to that part of air which is required for life, provides sufficient evidence for the discovery of oxygen by Sendivogius. This discovery of Sendivogius was however frequently denied by the generations of scientists and chemists which succeeded him. It is also commonly claimed that oxygen

4859-473: The 16th minute, Spartak took the lead through an Edgar Gess strike. The rest of the game was largely uneventful. Minutes before the end of the game, several hundred fans began to leave the stadium in an attempt to get to the Metro station ahead of the crowds. There are two covered stairways in the stadium under each stand, leading down to the exits. All of the exits at both stands were open. However, most of

4972-557: The 17th and the 18th century but none of them recognized it as a chemical element . This may have been in part due to the prevalence of the philosophy of combustion and corrosion called the phlogiston theory , which was then the favored explanation of those processes. Established in 1667 by the German alchemist J. J. Becher , and modified by the chemist Georg Ernst Stahl by 1731, phlogiston theory stated that all combustible materials were made of two parts. One part, called phlogiston,

5085-531: The 2s electrons, after sequential filling of the low σ and σ orbitals; σ overlap of the two atomic 2p orbitals that lie along the O–O molecular axis and π overlap of two pairs of atomic 2p orbitals perpendicular to the O–O molecular axis, and then cancellation of contributions from the remaining two 2p electrons after their partial filling of the π orbitals. This combination of cancellations and σ and π overlaps results in dioxygen's double-bond character and reactivity, and

5198-536: The American scientist Robert H. Goddard became the first person to develop a rocket engine that burned liquid fuel; the engine used gasoline for fuel and liquid oxygen as the oxidizer . Goddard successfully flew a small liquid-fueled rocket 56 m at 97 km/h on March 16, 1926, in Auburn, Massachusetts , US. In academic laboratories, oxygen can be prepared by heating together potassium chlorate mixed with

5311-614: The Dutch journalists, both exits at the stand were open. According to El País , the information about 3 fatalities and 60 injured was distributed by the Dutch news agency ANP . Three days later, on 26 October The New York Times wrote that "more than 20 persons were killed and dozens were injured in a panic at Lenin Stadium". Ten days later, in the article published on 5 November 1982, La Stampa stated that "it seems that 72 " people were killed and "at least 150" were injured in

5424-591: The Luzhiniki disaster, citing the unnamed "unofficial sources". By 1987, El País had lowered its number of estimated fatalities to 68 . Until 1989, none of these figures were either confirmed or challenged by the Soviet officials. Soviet citizens were able to learn the details of this disaster only from the reports of the Voice of America and other Western shortwave-radio broadcasters. The first publications in

5537-484: The Philosopher's Stone drawn from the source of nature and manual experience"] (1604) described a substance contained in air, referring to it as 'cibus vitae' (food of life, ) and according to Polish historian Roman Bugaj, this substance is identical with oxygen. Sendivogius, during his experiments performed between 1598 and 1604, properly recognized that the substance is equivalent to the gaseous byproduct released by

5650-602: The Soviet Union about the number of fatalities of the Luzhniki tragedy appeared only after the introduction of the Glasnost policy by Soviet leader Mikhail Gorbachev at the end of the 1980s. On 18 April 1989, seven years after the Luzhniki tragedy, Sovetsky Sport published a list of the football disasters in history, and mentioned the Luzhniki disaster among them. The journalists noticed that no information about

5763-438: The Sun's disk of protoplanetary material prior to the coalescence of dust grains that formed the Earth. Oxygen presents two spectrophotometric absorption bands peaking at the wavelengths 687 and 760  nm . Some remote sensing scientists have proposed using the measurement of the radiance coming from vegetation canopies in those bands to characterize plant health status from a satellite platform. This approach exploits

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5876-455: The West. A pair of journalists admitted in the article that they were not familiar with the archived evidence from the criminal investigation and therefore they did not know even the number of fatalities. So, they loosely estimated it at 340 fatalities, citing the unnamed "parents of the children who died", but admitting that it is "an unverified figure". The journalists went further, accusing

5989-493: The atmosphere. In the present equilibrium, production and consumption occur at the same rate. Free oxygen also occurs in solution in the world's water bodies. The increased solubility of O 2 at lower temperatures (see Physical properties ) has important implications for ocean life, as polar oceans support a much higher density of life due to their higher oxygen content. Water polluted with plant nutrients such as nitrates or phosphates may stimulate growth of algae by

6102-412: The bond order from three to two. Because of its unpaired electrons, triplet oxygen reacts only slowly with most organic molecules, which have paired electron spins; this prevents spontaneous combustion. In the triplet form, O 2 molecules are paramagnetic . That is, they impart magnetic character to oxygen when it is in the presence of a magnetic field, because of the spin magnetic moments of

6215-527: The chief of the police guards at the East Stand, S. Koryagin. The trial of the first two was held on 8 February 1983, three and a half months after the tragedy. Both were found guilty of negligence and both were sentenced to three years of imprisonment , the maximum penalty for a crime in the Soviet Criminal code . However, Kokryshev (as a person previously decorated by the state)

6328-428: The crush was probably caused by the fall of a woman, although La Stampa' s source of that information is unclear, as this detail was not revealed by Vechernyaya Moskva . On the next day, 23 October, Italian, Spanish and other Western newspapers stated that there were 3 people killed and 60 injured in this disaster, citing the Dutch journalists who were present at the match. They also mentioned, that, according to

6441-487: The crush, he even went as far as firing the interior minister Nikolai Shchelokov , the Soviet Union's top police officer, after learning of the corruption allegations against him. Shchelokov was later stripped of all state decorations, and committed suicide when he was about to go to trial. The criminal investigation of this disaster was launched by the Moscow Prosecutor's Office. Detective Aleksandr Shpeyer

6554-529: The crush, which made it Russia's worst sporting disaster . The number of fatalities in this crush was not officially revealed until seven years later, in 1989. Until then, this figure varied in press reports from 3 to 340 fatalities. The circumstances of this disaster are similar to those of the second Ibrox disaster in Scotland. On 20 October 1982, the weather in Moscow was snowy and extraordinarily cold for

6667-444: The diatomic elemental molecules in those gases. The first commercial method of producing oxygen was chemical, the so-called Brin process involving a reversible reaction of barium oxide . It was invented in 1852 and commercialized in 1884, but was displaced by newer methods in early 20th century. By the late 19th century scientists realized that air could be liquefied and its components isolated by compressing and cooling it. Using

6780-466: The electron spins are paired. It is much more reactive with common organic molecules than is normal (triplet) molecular oxygen. In nature, singlet oxygen is commonly formed from water during photosynthesis, using the energy of sunlight. It is also produced in the troposphere by the photolysis of ozone by light of short wavelength and by the immune system as a source of active oxygen. Carotenoids in photosynthetic organisms (and possibly animals) play

6893-446: The evidence for themselves, after making an official, but simple request, the detective advised. Unlike the "dark secret" article of Sovetsky Sport , the article in broadsheet Izvestia was hardly mentioned by the international media. The next day, Sovetsky Sport in its editorial admitted that its journalists, who wrote the sensational article two weeks earlier, had to use "conjectures" to provide details of this tragedy. At

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7006-596: The exchange of oxygen and carbon dioxide in the body. Similar broad definitions of mechanical asphyxia have occurred in Saukko and Knight's 2004 book on asphyxia, and Dolinak and Matshes' 2005 book on forensic pathology. According to Shkrum and Ramsay, mechanical asphyxia encompasses smothering, choking, positional asphyxia, traumatic asphyxia, wedging, strangulation and drowning. Sauvageau and Boghossian propose in 2010 that mechanical asphyxia should be officially defined as caused by "restriction of respiratory movements, either by

7119-427: The fact that in those bands it is possible to discriminate the vegetation's reflectance from its fluorescence , which is much weaker. The measurement is technically difficult owing to the low signal-to-noise ratio and the physical structure of vegetation; but it has been proposed as a possible method of monitoring the carbon cycle from satellites on a global scale. Luzhniki disaster The Luzhniki disaster

7232-572: The fact that the Englishman Priestley had first isolated the gas and written about it. This is partly due to a poem praising the gas titled "Oxygen" in the popular book The Botanic Garden (1791) by Erasmus Darwin , grandfather of Charles Darwin . John Dalton 's original atomic hypothesis presumed that all elements were monatomic and that the atoms in compounds would normally have the simplest atomic ratios with respect to one another. For example, Dalton assumed that water's formula

7345-575: The facts". The author of this article, Vladimir Geskin, stated that "there were no reasons to doubt the results of the investigation", reported by Izvestia on 20 July. Despite its refutation in 1989, the figure of 340 fatalities or its variations ("more than 300", "closer to 350", "hundreds", etc.), is still often reproduced by some international media. Other details from the "dark secret" article in Sovetsky Sport (e.g., that only one stand and one exit were opened for spectators, or that there

7458-404: The fan in need, but the moving dense crowd on the stairs, limited by metal banisters, crushed them down. People began to stumble over the bodies of those who were crushed in a crowd collapse . More and more mostly teenage fans were joining the crowd on the stairs, trying to push their way down and unaware of the tragedy unfolding below, which caused a pile-up of people. The crush coincided with

7571-401: The fans from the East Stand rushed to Stairway 1, closer to the Metro station. According to the witnesses who were interviewed during the investigation, one of the fans fell at the lower steps of Stairway 1. According to some reports, it was a young woman, who had lost her shoe on the stairs and stopped, trying to retrieve it and put it back on. A couple of people also stopped, trying to help

7684-399: The first known experiments on the relationship between combustion and air was conducted by the 2nd century BCE Greek writer on mechanics, Philo of Byzantium . In his work Pneumatica , Philo observed that inverting a vessel over a burning candle and surrounding the vessel's neck with water resulted in some water rising into the neck. Philo incorrectly surmised that parts of the air in

7797-647: The football match at the Grand Sports Arena of the Central Lenin Stadium, as spectators were on their way out, an accident took place due to disturbances in the movement of people. There were casualties. An investigation into the circumstances of the accident is under way. On 21 and 24 October 1982, two Soviet national sports newspapers   —   the daily Sovetsky Sport and weekly Football-Hockey  —   published detailed accounts of this match, but neither mentioned

7910-551: The four stands for fans: the East Stand ("C") and the West Stand ("A"), to have enough time to clean snow from the stands before the game. Each stand had seating for 23,000 spectators. Most of the fans (about 12,000) went to the East Stand, which was closer to the Metro station . There were approximately 100 Dutch supporters; the vast majority of fans in attendance were fans of Spartak Moscow. The match started at 7:00 pm. In

8023-561: The heavy sleeping adult may move on top of the infant, causing compression asphyxia. In fatal crowd disasters, compressive asphyxia from being crushed against the crowd causes all or nearly all deaths, rather than blunt trauma from trampling. This is what occurred at the Ibrox disaster in 1971, where 66 Rangers fans died; the 1979 The Who concert disaster where 11 died; the Luzhniki disaster in 1982, when 66 FC Spartak Moscow fans died;

8136-408: The history". By the end of next day, The New York Times , Los Angeles Times , The Washington Post , La Stampa , la Repubblica , Le Monde , die Tageszeitung , and other leading newspapers publicized this information all over the world. Two weeks later, on 20 July 1989, the Soviet newspaper of record Izvestia published an interview with a Detective Aleksandr Shpeyer, who

8249-399: The idea; instead, it was based on observations of what happens when something burns, that most common objects appear to become lighter and seem to lose something in the process. Polish alchemist , philosopher , and physician Michael Sendivogius (Michał Sędziwój) in his work De Lapide Philosophorum Tractatus duodecim e naturae fonte et manuali experientia depromti ["Twelve Treatises on

8362-475: The injured. The bodies of the dead were taken to the Moscow morgues for autopsy and identification . Later the bodies were returned to the victims' relatives for burial. A total of 66 people died in this crush, 45 of whom were teenagers as young as 14, including five women. According to the post-mortem examinations, all of the fatalities died of compressive asphyxia . Another 61 people were injured, including 21 seriously. The Luzhniki Stadium tragedy

8475-504: The letter was found in Scheele's belongings after his death). Lavoisier conducted the first adequate quantitative experiments on oxidation and gave the first correct explanation of how combustion works. He used these and similar experiments, all started in 1774, to discredit the phlogiston theory and to prove that the substance discovered by Priestley and Scheele was a chemical element . In one experiment, Lavoisier observed that there

8588-428: The majority of these have half-lives that are less than 83 milliseconds. The most common decay mode of the isotopes lighter than O is β decay to yield nitrogen, and the most common mode for the isotopes heavier than O is beta decay to yield fluorine . Oxygen is the most abundant chemical element by mass in the Earth's biosphere , air, sea and land. Oxygen is the third most abundant chemical element in

8701-428: The middle of October, −10 °C (14 °F). There were 82,000 match tickets available, but because of the freezing weather conditions only about 16,500 tickets were sold. The Grand Arena of Central Lenin Stadium (also called Olympic Stadium) did not have a roof over the seating at the time (it was installed in the 1997 improvements). In preparation for the match, the stadium management decided to open only two of

8814-418: The most successful and biodiverse terrestrial clade , oxygen is directly conducted to the internal tissues via a deep network of airways . Many major classes of organic molecules in living organisms contain oxygen atoms, such as proteins , nucleic acids , carbohydrates and fats , as do the major constituent inorganic compounds of animal shells, teeth, and bone. Most of the mass of living organisms

8927-494: The nitroaereus must have combined with it. He also thought that the lungs separate nitroaereus from air and pass it into the blood and that animal heat and muscle movement result from the reaction of nitroaereus with certain substances in the body. Accounts of these and other experiments and ideas were published in 1668 in his work Tractatus duo in the tract "De respiratione". Robert Hooke , Ole Borch , Mikhail Lomonosov , and Pierre Bayen all produced oxygen in experiments in

9040-450: The number of fatalities in Luzhniki had ever been revealed in the Soviet media and suggested that there were about 100 fatalities, without providing any reference. The information from this article was immediately reproduced by Italian, French, Spanish and other international media outlets. Three months later, on 8 July 1989, Sovetsky Sport published another article, "Luzhniki's Dark Secret", which received even more publicity in

9153-454: The opponent, and create openings for transitions , as the opponent is forced to react to the smothering. In some cases, when performing certain routines, smothering is combined with simultaneous compressive asphyxia. One example is overlay, in which an adult accidentally rolls over onto an infant during co-sleeping , an accident that often goes unnoticed and is mistakenly thought to be sudden infant death syndrome . Other accidents involving

9266-454: The photosynthetic activities of autotrophs such as cyanobacteria , chloroplast -bearing algae and plants. A much rarer triatomic allotrope of oxygen , ozone ( O 3 ), strongly absorbs the UVB and UVC wavelengths and forms a protective ozone layer at the lower stratosphere , which shields the biosphere from ionizing ultraviolet radiation . However, ozone present at the surface

9379-477: The police officers at the stadium of provoking this disaster and making some other allegations. Though full of numerous factual mistakes and fabricated details, this article immediately became a sensation in the Western media. Reuters , Associated Press , Agence France-Presse , UPI , and other news agencies replicated the news about the "340 fatalities" of the "worst-ever sporting disaster in

9492-592: The position of the body or by external chest compression", thus encompassing only positional asphyxia and traumatic asphyxia. If there are symptoms of mechanical asphyxia, it is necessary to call the Emergency Medical Services . In some countries, such as the US, there may also be self-acting groups of voluntary first responders who have been trained in first aid. In case of mechanical asphyxia, first aid can be provided on your own. In case of choking on

9605-458: The remainder of this article. Trioxygen ( O 3 ) is usually known as ozone and is a very reactive allotrope of oxygen that is damaging to lung tissue. Ozone is produced in the upper atmosphere when O 2 combines with atomic oxygen made by the splitting of O 2 by ultraviolet (UV) radiation. Since ozone absorbs strongly in the UV region of the spectrum , the ozone layer of

9718-559: The same time, the editors expressed their satisfaction over the worldwide response evoked by their article. In a special press conference in Moscow in August 1989, the Moscow Prosecutor's Office confirmed that there had been 66 fatalities in the Luzhniki disaster. On 27 September 1989, Sovetsky Sport finally admitted that information provided by their journalists "could not be confirmed" and that "emotions had prevailed over

9831-414: The seawater left behind tends to be higher in oxygen-18. Marine organisms then incorporate more oxygen-18 into their skeletons and shells than they would in a warmer climate. Paleoclimatologists also directly measure this ratio in the water molecules of ice core samples as old as hundreds of thousands of years. Planetary geologists have measured the relative quantities of oxygen isotopes in samples from

9944-522: The second goal for Spartak, which was scored by Sergei Shvetsov twenty seconds before the final whistle. The injured were taken by ambulances to the NV Sklifosovsky Scientific Research Institute of First Aid in Moscow. The next day Yuri Andropov (who replaced Leonid Brezhnev as leader of the country , less than a month after this disaster) visited the institute and met several doctors and relatives of

10057-599: The spectator tragedy that occurred. The article in Vechernyaya Moskva did not go unnoticed by the West. It was reproduced by the Italian news agency ANSA . On 22 October, two days after the tragedy, La Stampa published a front-page article, where it revealed the information from the Soviet newspaper to its readers and speculated whether the word "casualties" should be understood as "injured" or "injured and killed". In this article La Stampa also said that

10170-440: The universe after hydrogen and helium . At standard temperature and pressure , two oxygen atoms will bind covalently to form dioxygen , a colorless and odorless diatomic gas with the chemical formula O 2 . Dioxygen gas currently constitutes 20.95% molar fraction of the Earth's atmosphere , though this has changed considerably over long periods of time in Earth's history . Oxygen makes up almost half of

10283-486: The universe, after hydrogen and helium. About 0.9% of the Sun 's mass is oxygen. Oxygen constitutes 49.2% of the Earth's crust by mass as part of oxide compounds such as silicon dioxide and is the most abundant element by mass in the Earth's crust . It is also the major component of the world's oceans (88.8% by mass). Oxygen gas is the second most common component of the Earth's atmosphere , taking up 20.8% of its volume and 23.1% of its mass (some 10 tonnes). Earth

10396-401: The unpaired electrons in the molecule, and the negative exchange energy between neighboring O 2 molecules. Liquid oxygen is so magnetic that, in laboratory demonstrations, a bridge of liquid oxygen may be supported against its own weight between the poles of a powerful magnet. Singlet oxygen is a name given to several higher-energy species of molecular O 2 in which all

10509-435: The upper atmosphere functions as a protective radiation shield for the planet. Near the Earth's surface, it is a pollutant formed as a by-product of automobile exhaust . At low earth orbit altitudes, sufficient atomic oxygen is present to cause corrosion of spacecraft . The metastable molecule tetraoxygen ( O 4 ) was discovered in 2001, and was assumed to exist in one of the six phases of solid oxygen . It

10622-413: The vehicle, or following loss of consciousness to be followed by death while in a coma, having presented with anoxic brain damage. The asphyxia can be caused by facial compression, neck compression, or chest compression. This occurs mostly during restraint and handcuffing situations by law enforcement, including psychiatric incidents. The weight of the restraint(s) doing the compression may contribute to what

10735-451: The vessel were converted into the classical element fire and thus were able to escape through pores in the glass. Many centuries later Leonardo da Vinci built on Philo's work by observing that a portion of air is consumed during combustion and respiration . In the late 17th century, Robert Boyle proved that air is necessary for combustion. English chemist John Mayow (1641–1679) refined this work by showing that fire requires only

10848-428: Was HO, leading to the conclusion that the atomic mass of oxygen was 8 times that of hydrogen, instead of the modern value of about 16. In 1805, Joseph Louis Gay-Lussac and Alexander von Humboldt showed that water is formed of two volumes of hydrogen and one volume of oxygen; and by 1811 Amedeo Avogadro had arrived at the correct interpretation of water's composition, based on what is now called Avogadro's law and

10961-548: Was a deadly crowd crush that took place at the Grand Sports Arena of the Central Lenin Stadium ( Russian : Большая спортивная арена Центрального стадиона им. В. И. Ленина , now known as Luzhniki Stadium ) in Moscow during the 1982–83 UEFA Cup match between FC Spartak Moscow and HFC Haarlem on 20 October 1982. According to the official enquiry, 66 FC Spartak Moscow fans , mostly adolescents , died in

11074-498: Was a head-on collision of two fans' crowds moving in the opposite directions after the second goal) also sometimes resurface in modern publications. In 2007 NTV aired its "Fatal Goal" ( Роковой гол ) documentary in Russia about the Luzhniki disaster. In 2008, ESPN Classic aired a Dutch documentary "Russian Night, the hidden football disaster" throughout Europe. The only book about this disaster, Drama in het Lenin-stadion ,

11187-621: Was appointed in charge of it. 150 witnesses were interviewed during the investigation. It produced 10 volumes of evidence, and took about three months to complete. On 26 November, one month after the disaster, the first criminal charges were made against Stadium Director Victor Kokryshev and Stadium Manager Yuri Panchikhin. They were detained and placed in Butyrka prison . Four officials were eventually charged in relation to this disaster: Stadium Director Victor Kokryshev, Stadium Manager Yuri Panchikhin, Stadium Deputy Director K. Lyzhin and

11300-522: Was eligible for a recent amnesty (on the occasion of the 60th anniversary of the creation of the USSR ) and was released. For Panchikhin, according to the same amnesty rules, the sentence was halved. The other two officials, Deputy Director Lyzhin and police chief Major Koryagin, did not stand trial in February for medical reasons. Lyzhin, a World War II veteran, was admitted to the hospital after

11413-408: Was first discovered by Swedish pharmacist Carl Wilhelm Scheele . He had produced oxygen gas by heating mercuric oxide (HgO) and various nitrates in 1771–72. Scheele called the gas "fire air" because it was then the only known agent to support combustion. He wrote an account of this discovery in a manuscript titled Treatise on Air and Fire , which he sent to his publisher in 1775. That document

11526-451: Was given off when the substance containing it was burned, while the dephlogisticated part was thought to be its true form, or calx . Highly combustible materials that leave little residue , such as wood or coal, were thought to be made mostly of phlogiston; non-combustible substances that corrode, such as iron, contained very little. Air did not play a role in phlogiston theory, nor were any initial quantitative experiments conducted to test

11639-554: Was in charge of the 1982 investigation of the Luzhniki disaster. In this article, named "The Tragedy at Luzhniki: Facts and Fabrication", Detective Shpeyer provided various factual details of the disaster and revealed the real number of fatalities ( 66 ) and injured (61). When being asked, why this information was hidden from the public for so many years, Shpeyer replied that the Prosecutor's Office did not hide any information. The archives are open and any researcher could explore

11752-491: Was independently developed in 1895 by German engineer Carl von Linde and British engineer William Hampson . Both men lowered the temperature of air until it liquefied and then distilled the component gases by boiling them off one at a time and capturing them separately. Later, in 1901, oxyacetylene welding was demonstrated for the first time by burning a mixture of acetylene and compressed O 2 . This method of welding and cutting metal later became common. In 1923,

11865-445: Was no overall increase in weight when tin and air were heated in a closed container. He noted that air rushed in when he opened the container, which indicated that part of the trapped air had been consumed. He also noted that the tin had increased in weight and that increase was the same as the weight of the air that rushed back in. This and other experiments on combustion were documented in his book Sur la combustion en général , which

11978-465: Was not sensibly different from that of common air , but I fancied that my breast felt peculiarly light and easy for some time afterwards." Priestley published his findings in 1775 in a paper titled "An Account of Further Discoveries in Air", which was included in the second volume of his book titled Experiments and Observations on Different Kinds of Air . Because he published his findings first, Priestley

12091-449: Was played at Luzhniki between the former players of FC Spartak Moscow and HFC Haarlem. The Luzhniki disaster is sometimes compared with the second Ibrox disaster . Both of the crushes happened at the end of the match, when a fall on the stairs of one of the spectators caused a chain-reaction pile-up. There was also the same number of fatalities in both crushes – 66, many of whom were youths. Furthermore, both crushes coincided with

12204-408: Was proven in 2006 that this phase, created by pressurizing O 2 to 20  GPa , is in fact a rhombohedral O 8 cluster . This cluster has the potential to be a much more powerful oxidizer than either O 2 or O 3 and may therefore be used in rocket fuel . A metallic phase was discovered in 1990 when solid oxygen is subjected to a pressure of above 96 GPa and it

12317-504: Was published in 1777. In the meantime, on August 1, 1774, an experiment conducted by the British clergyman Joseph Priestley focused sunlight on mercuric oxide contained in a glass tube, which liberated a gas he named "dephlogisticated air". He noted that candles burned brighter in the gas and that a mouse was more active and lived longer while breathing it. After breathing the gas himself, Priestley wrote: "The feeling of it to my lungs

12430-462: Was published in 1777. In that work, he proved that air is a mixture of two gases; 'vital air', which is essential to combustion and respiration, and azote (Gk. ἄζωτον "lifeless"), which did not support either. Azote later became nitrogen in English, although it has kept the earlier name in French and several other European languages. Lavoisier renamed 'vital air' to oxygène in 1777 from

12543-604: Was published in Dutch in the Netherlands in 2007. On 6 June 2018, in the run-up to the 2018 FIFA World Cup , the British newspaper, The Daily Telegraph published an article that suggested that the true scale of the disaster has been covered up by the Russian state and that the death toll was considerably higher than the official figure of 66. The article suggests that the tragedy was caused by police attempting to arrest Spartak fans who were singing "subversive" songs against

12656-420: Was shown in 1998 that at very low temperatures, this phase becomes superconducting . Oxygen dissolves more readily in water than nitrogen, and in freshwater more readily than in seawater. Water in equilibrium with air contains approximately 1 molecule of dissolved O 2 for every 2 molecules of N 2 (1:2), compared with an atmospheric ratio of approximately 1:4. The solubility of oxygen in water

12769-444: Was the Soviet Union's worst sporting disaster. A thorough investigation of the Luzhniki disaster corresponded with the new policies of Yuri Andropov , a former KGB head, who became the leader of the country a month after the tragedy. He became known in the Soviet Union for his efforts to restore discipline at all levels of the society that had been loosened by the last years of Brezhnev's rule. On 17 December 1982, two months after

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