In the operation of a nuclear reactor , criticality is the state in which a nuclear chain reaction is self-sustaining—that is, when reactivity is zero. In supercritical states, reactivity is greater than zero.
63-538: Silwood Park is the rural campus of Imperial College London , England. It is situated near the village of Sunninghill , near Ascot in Berkshire. Since 1986, there have been major developments on the site with four new college buildings. Adjacent to these buildings is the Technology Transfer Centre: a science park with units leased to commercial companies for research. There are a number of
126-812: A cultural area in South Kensington that included museums, colleges, and the Royal Albert Hall . In 1907, these colleges – the Royal College of Science , the Royal School of Mines , and the City and Guilds of London Institute – merged to form the Imperial College of Science and Technology. In 1988, Imperial merged with St Mary's Hospital Medical School and then with Charing Cross and Westminster Medical School to form
189-481: A large number of spin-out companies based on academic research. Imperial researcher Narinder Singh Kapany made critical contributions to the invention of fibre optics . The United States is the college's top foreign country for collaborations, and Imperial College has a long-term partnership with the Massachusetts Institute of Technology that dates from World War II . In January 2018,
252-405: A research collaboration that aims to find innovative ways to improve the precision of cancer treatments, inaugurated by Joe Biden as part of his Biden Cancer Initiative. Neil Ferguson's 16 March 2020 report entitled "Impact of non-pharmaceutical interventions to reduce COVID-19 mortality and healthcare demand" was described in a New York Times article as the coronavirus "report that jarred
315-636: A scientific education. The main campus is located in South Kensington , with an additional campus in White City . The Faculty of Medicine also operates five teaching hospitals across London and is a founding institution of the Francis Crick Institute . The earliest college that led to the formation of Imperial was the Royal College of Chemistry , founded in 1845, with the support of Prince Albert and parliament . This
378-421: A thousand postgraduate students have been trained at Silwood since its establishment, about half of them taking PhDs. They have come from more than sixty countries, and Silwood-trained graduates have gone to almost every corner of the globe. There are over 200 graduate staff and students working there at any one time. Undergraduates from South Kensington attend for field courses and some final-year projects. In 1981,
441-553: A university with its own degree awarding powers, independent of the University of London. In response, the University of London changed its regulations in 1925 so that the courses taught only at Imperial would be examined by the university, enabling students to gain a Bachelor of Science. In October 1945, George VI and Queen Elizabeth visited Imperial to commemorate the centenary of the Royal College of Chemistry, which
504-634: Is a postgraduate campus of Imperial in the village of Sunninghill near Ascot in Berkshire. The Silwood Park campus remains a centre for research and teaching in ecology, evolution, and conservation. It is set in 100 hectares of parkland used for ecological field experiments. Imperial has teaching hospitals across London which are used by the School of Medicine for undergraduate clinical teaching and medical research. All are based around college-affiliated hospitals, and also provide catering and sport facilities. College libraries are located on each campus, including
567-642: Is currently one of the largest in the UK and in 2012/13 had a turnover of £971.3 million, employed approximately 9,770 people and treated almost 1.2 million patients. Other (non-academic health science centres) hospitals affiliated with Imperial College include Chelsea and Westminster Hospital , Royal Brompton Hospital , West Middlesex University Hospital , Hillingdon Hospital , Mount Vernon Hospital , Harefield Hospital , Ealing Hospital , Central Middlesex Hospital , Northwick Park Hospital , St Mark's Hospital , St Charles' Hospital and St Peter's Hospital . Imperial
630-426: Is said to be critical) when each fission releases a sufficient number of neutrons to sustain an ongoing series of nuclear reactions. The International Atomic Energy Agency defines the first criticality date as the date when the reactor is made critical for the first time. This is an important milestone in the construction and commissioning of a nuclear power plant . This radioactivity –related article
693-466: Is supported by the UK's largest mentoring system, inspired by MIT's model. The university's Enterprise Lab has a high 79 per cent survival rate for startups . Reflecting this, the 2023 QS MBA Rankings by Career Specialisation in Entrepreneurship placed Imperial's MBA programme third in the world, while the 2018 Reuters World's Most Innovative Universities ranking placed Imperial eighth in
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#1732798074535756-439: Is the governing body of Imperial. The council consists of between 19 and 27 members, with an independent chair and ex officio members being the president, the provost, the chief operating officer, the president of Imperial College Union, and four senior staff members. There are also up to four further staff members (comprising one member elected by the academic staff, one further appointed member of academic staff and two members of
819-432: Is uneven at approximately 64:36 overall, and 5:1 or higher in some engineering courses. However, medicine has an approximate 1:1 ratio with biology degrees tending to be higher. Imperial College Union is the students' union and is run by five full-time sabbatical officers elected from the student body for a tenure of one year, and a number of permanent members of staff. It is split into constituent unions aligned with
882-634: Is widely recognised as one of the UK's elite universities. In 2025, the QS World University Rankings ranked Imperial second in the world, behind MIT , equalling its highest ever position. Similarly, the Times Higher Education World University Rankings ranked it ninth in the world. Imperial has cultivated an entrepreneurial culture by integrating business and finance disciplines across its science-focused curriculum. This approach
945-504: The City and Guilds of London Institute was opened as a technical education school on Exhibition Road by the Prince of Wales in 1884, with courses beginning in 1885. At the start of the 20th century, there was a concern that Great Britain was falling behind Germany in scientific and technical education. A departmental committee was set up at the Board of Education in 1904, to look into
1008-436: The Francis Crick Institute and MedCity . Imperial is a long-term partner of the Massachusetts Institute of Technology , with the first formal large-scale collaboration agreement dating back to 1944 as part of World War II scientific effort. The partnership between the two institutions continues with exchange programs for students and academic staff. In the 2021 Research Excellence Framework , Imperial's research profile
1071-793: The Imperial College Act 1997 formally establishing the Imperial College School of Medicine. In 2003, Imperial was granted degree-awarding powers in its own right by the Privy Council . In 2004, the Imperial College Business School and a new main college entrance on Exhibition Road were opened. The UK Energy Research Centre was also established in 2004 and opened its headquarters at Imperial. On 9 December 2005, Imperial announced that it would commence negotiations to secede from
1134-672: The Imperial College School of Medicine . The Imperial College Business School was established in 2003 and officially opened by Queen Elizabeth II . Formerly a constituent college of the University of London , Imperial became an independent university in 2007. Imperial is organised into four faculties: Engineering , Medicine , Natural Sciences , and Business . The university fosters innovation and enterprise across all its faculties by integrating business courses into science degrees and providing business students with
1197-573: The National Art Library . The campus has many restaurants and cafés run by the college, and contains much of the college's student accommodation, including the Prince's Garden Halls, and Beit Hall , home to the college union , which runs student pubs, a nightclub, and a cinema on site. To the north, within easy walking distance of the college, are Kensington Gardens and Hyde Park , with green spaces and sports facilities used by many of
1260-697: The Royal Fine Arts Commission and others meant that Queen's Tower was retained, with work carried out between 1966 and 1968 to make it free standing. New laboratories for biochemistry, established with the support of a £350,000 grant from the Wolfson Foundation , were opened by the Queen in 1965. In 1988, Imperial merged with St Mary's Hospital Medical School under the Imperial College Act 1988. Amendments to
1323-565: The provost is Ian Walmsley and the chair is Vindi Banga. The college's endowment is sub-divided into three distinct portfolios: Imperial is a member of the Association of Commonwealth Universities , European University Association , Global Alliance of Technological Universities , League of European Research Universities and the Russell Group . It is a founding member of the Imperial College academic health sciences centre ,
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#17327980745351386-585: The royal charter changed the formal name of the institution to The Imperial College of Science, Technology and Medicine and made St Mary's a constituent college. This was followed by mergers with the National Heart and Lung Institute in 1995 and the Charing Cross and Westminster Medical School , Royal Postgraduate Medical School and the Institute of Obstetrics and Gynaecology in 1997, with
1449-427: The 7th lowest offer rate across the country. The undergraduate courses with the highest ratios of applicants to admissions were computing (19.2:1), mathematics (14.6:1) and mechanical engineering (11.2:1). The postgraduate courses with the highest ratios of applicants to admissions were computing (21:1), mathematics (17.9:1), and electrical engineering (14:1). Imperial is among the most international universities in
1512-708: The El Salvador Project , a construction based project in Central America. The Union also hosts sports-related clubs such as Imperial College Boat Club and Imperial College Gliding Club . The Union operates on two sites, with most events at the Union Building on Beit Quad at South Kensington, with mostly medical school events at the Reynold's bar, Charing Cross . Sports facilities at Imperial's London campuses include four gyms, including
1575-643: The Fleming library at St Mary's. Imperial is organised into four faculties: the Faculty of Engineering, the Faculty of Medicine, the Faculty of Natural Sciences, and the Imperial College Business School. As of 2024, the academic departments are: Faculty of Engineering Faculty of Medicine Faculty of Natural Sciences Imperial College Business School Imperial hosts centres to promote inter-disciplinary work under
1638-511: The Royal School of Mines and the Royal College of Science. It also made provisions for the City and Guilds College to join once conditions regarding its governance were met, as well as for Imperial to become a college of the University of London . The college joined the University of London on 22 July 1908, with the City and Guilds College joining in 1910. The main campus of Imperial College
1701-568: The South Kensington campus, one at the Imperial College Union and one at Eastside. There are a number of pubs and bars on campus and also surrounding the campus, which become a popular social activity for Imperial's students. The Pewter tankard collection at Imperial College Union is the largest in Europe, with the majority of clubs and societies having tankards associated with their clubs. Imperial College Radio ( ICRadio )
1764-540: The U.S. and the U.K. to action". Since 18 May, Imperial College's Dr. Samir Bhatt has been advising the state of New York for its reopening plan. The governor of New York , Andrew Cuomo , said at the time that "the Imperial College model, as we've been following this for weeks, was the best, most accurate model." In the academic year 2021/22, the ratio of applicants to admissions was 9:1 for undergraduates and 7.7:1 for postgraduates. The university gave offers of admission to 30.1% of its undergraduate applicants in 2022,
1827-522: The United Kingdom, with 50% of students from the UK, 16% of students from the EU, and 34% of students from outside the UK or EU. The student body is 39% female and 61% male. 36.5% of Imperial's undergraduates are privately educated , the fourth highest proportion amongst mainstream British universities. The college's main library is located next to Queen's Lawn and contains the main corpus of
1890-491: The United States. The Percy Report of 1945 and Barlow Committee in 1946 called for a "British MIT "-equivalent, backed by influential scientists as politicians of the time, including Lord Cherwell , Sir Lawrence Bragg and Sir Edward Appleton . The University Grants Committee strongly opposed however, and so a compromise was reached in 1953, where Imperial would remain within the university, but double in size over
1953-568: The University of London. Imperial became fully independent of the University of London in July 2007. In April 2011, Imperial and King's College London joined the UK Centre for Medical Research and Innovation as partners with a commitment of £40 million each to the project. The centre was later renamed the Francis Crick Institute and opened on 9 November 2016. It is the largest single biomedical laboratory in Europe. The college began moving into
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2016-853: The college's collection. It previously also housed the Science Museum 's library until 2014. The Fleming library is located at St Mary's in Paddington , originally the library of St Mary's Hospital Medical School , with other hospital campuses also having college libraries. The Imperial Faculty of Medicine was formed through mergers between Imperial and the St Mary's, Charing Cross and Westminster, and Royal Postgraduate medical schools and has six teaching hospitals . It accepts more than 300 undergraduate medical students per year and has around 321 taught and 700 research full-time equivalent postgraduate students. Imperial College Healthcare NHS Trust
2079-638: The demolition of the reactor building. In 1984, the CAB International Institute of Biological Control (IIBC) moved its headquarters to Silwood Park. From 1989-2008, the Institute occupied its own new building at Silwood Park, which also housed the Michael Way Library, specialising in ecology, entomology and crop protection. From January 1998, IIBC and its sister Institutes of Entomology, Mycology and Parasitology were integrated on two sites as CABI Bioscience. The Silwood site
2142-491: The departments of Zoology and Botany were merged to form the Department of Biology. A low power nuclear research reactor (100 kW thermal), named CONSORT II, was licensed at the site on 20 December 1962, completed February 1963, and achieved first criticality in 1965. After a decline in research conducted there, the reactor was shut down in 2012 and defueled by 2014. The reactor was decommissioned in 2021, followed by
2205-636: The divisions of Faculty of Natural Sciences that have a presence on the campus. Additionally, Silwood Park is home to the NERC Centre for Population Biology (CPB), the International Pesticide Application Research Consortium (IPARC). Prior to World War II , Silwood Park was a private residence —the manor house of Sunninghill —then during the war, it became a convalescent home for airmen. The original manor at which Prince Arthur stayed in 1499
2268-541: The emphasis has been on ecology and evolutionary biology. Staff and research students of the Zoology Department were the first college personnel at Silwood when the Field Station moved from Slough , but the department of Civil Engineering has used it since 1947 for courses in surveying. Botany and Meteorology started work there about thirty years ago and the nuclear reactor was opened in 1965. Over
2331-590: The faculties of the college, carrying on the association with the original constituent colleges of Imperial, the Royal College of Science Union , City and Guilds College Union , Royal School of Mines Students' Union and Imperial College School of Medicine Students' Union . The Union is given a large subvention by the university, much of which is spent on maintaining over 300 clubs, projects and societies. Examples of notable student groups and projects are Project Nepal which sends Imperial College students to work on educational development programmes in rural Nepal and
2394-448: The future of the Royal College of Science. A report released in 1906 called for the establishment of an institution unifying the Royal College of Science and the Royal School of Mines, as well as – if an agreement could be reached with the City and Guilds of London Institute – its Central Technical College. On 8 July 1907, Edward VII granted a Royal Charter establishing the Imperial College of Science and Technology. This incorporated
2457-495: The heart of the campus overlooking Queen's Lawn . As part of a cultural centre known as Albertopolis the campus is surrounded by many of London's most popular attractions, including the Royal Albert Hall and Kensington Palace , museums including the Natural History Museum , Science Museum , and Victoria and Albert Museum , and institutions such as the Royal College of Art , the Royal College of Music , and
2520-631: The highest median salaries across all subjects of any UK university. For the 2022/23 academic year, Imperial had a total full-time student body of 19,400, consisting of 10,475 undergraduate students and 8,925 postgraduates. 50.7% of the student body is from outside of the UK. 32% of all full-time students came from outside the European Union in 2013–14, and around 13% of the International students had Chinese nationality in 2007–08. Imperial's male to female ratio for undergraduate students
2583-623: The main Ethos gym at the South Kensington Campus, two swimming pools and two sports halls. Imperial has additional sports facilities at the Heston and Harlington sports grounds. On the South Kensington campus, there are a total of six music practice rooms which consist of upright pianos for usage by people of any grade, and grand pianos which are exclusively for people who have achieved Grade 8 or above. There are two student bars on
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2646-647: The mathematics department of Imperial and the French National Centre for Scientific Research launched an "international joint research unit" ( unité mixte internationale ; UMI) at Imperial, known as UMI Abraham de Moivre after the French mathematician , focused on unsolved problems and bridging British and French scientific communities. In October 2018, Imperial College launched the Imperial Cancer Research UK Center,
2709-695: The new White City campus in 2016, with the launching of the Innovation Hub. This was followed by the opening of the Molecular Sciences Research Hub for the Department of Chemistry , officially opened by Mayor of London , Sadiq Khan in 2019. In 2014, Stefan Grimm , of the Department of Medicine, was found dead after being told that he was "struggling to fulfil the metrics" of his professorial post. The college announced an internal inquiry into his death, and found that
2772-423: The new manor house as "Red brick and huge. Free Tudor with a freer tower" . Waterhouse's use of Silwood-style bricks for new university buildings at Manchester and London gave rise to the phrase red-brick universities . In 1947, Silwood Park was purchased by Imperial College for entomological research and field studies. Initially, pioneering developments in insect pest management took place, but more recently
2835-645: The next ten years. The expansion led to a number of new buildings being erected. These included the Hill building in 1957 and the Physics building in 1960, and the completion of the East Quadrangle, built in four stages between 1959 and 1965. The building work also meant the demolition of the City and Guilds College building in 1962–63, and the Imperial Institute's building by 1967. Opposition from
2898-478: The opening of the Royal School of Mines and Natural History Museum . In 1881, the Normal School of Science was established in South Kensington under the leadership of Thomas Huxley , taking over responsibility for the teaching of the natural sciences and agriculture from the Royal School of Mines. The school was renamed the Royal College of Science by royal consent in 1890. The Central Institution of
2961-561: The performance metrics for his position were unreasonable, with new metrics for performance being needed. The South Kensington campus is the college's main campus, where most teaching and research takes place. It is home to many notable buildings, such as the Business School , Royal School of Mines , and Royal College of Science . It is also the original site of the Imperial Institute , whose Queen's Tower stands at
3024-417: The professional services staff), up to one further representative of Imperial College Union, and between nine and 13 other independent members, with the proviso that the independent members (including the chair) must comprise the majority. The president is the highest academic official and chief executive of Imperial College London. The position has been held by Hugh Brady , since August 2022 . As of 2024,
3087-535: The reigning monarch of the United Kingdom, Queen Victoria . An enormously popular and financial success, proceeds from the Great Exhibition were designated to develop an area for cultural and scientific advancement in South Kensington . Within the next six years the Victoria and Albert Museum and Science Museum had opened, joined by new facilities in 1871 for the Royal College of Chemistry, and in 1881
3150-602: The streams that flow through the Park. The grounds were landscaped by Humphry Repton , most celebrated landscape designer of his generation. In 1854 Silwood was bought by Lancashire cotton mill owner John Hargreaves Jr from the widow of Mr Forbes and Silwood Lodge added thereafter. Mary Hargreaves (née Hick) received socialite Rose O'Neale Greenhow as a guest in April 1864 and was an associate of novelist Mrs Oliphant . John Hargreaves died in 1874 and his trustees , one of whom
3213-596: The student clubs. Imperial has a new second major campus in White City providing a platform for innovation and entrepreneurship . This campus was built on land previously owned by BBC. The hub houses research facilities, postgraduate accommodation, as well as a commercialisation space. The campus is home to the Scale Space and incubator , Invention Rooms, a college hackerspace and community outreach centre. The White City campus also includes another biomedical centre funded by Sir Michael Uren . Silwood Park
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#17327980745353276-588: The titles of Global Challenge institutes, Imperial Centres of Excellence and Imperial Networks of Excellence. It also participates as a partner in a number of national institutes. The Centre for Languages, Culture and Communication operates as Imperial College London's adult education centre, offering evening class courses in the arts, humanities, languages and sciences. The university also houses two academic centres offering teaching to undergraduate and postgraduate students in subjects outside of science, technology and medicine. The academic centres are the: The council
3339-707: The world. Imperial's focus on entrepreneurship and industry placements, along with the subject mix taught, has led to high employability of its graduates. In 2024, Imperial was ranked first in the UK for highly skilled employment or further studies by the Complete University Guide , the Guardian University Guide , and the Times Good University Guide . An analysis of Higher Education Statistics Agency salary data for 2021 found that Imperial graduates had
3402-512: Was John Hick , sold the estate to engineer Charles Patrick Stewart in 1875. Silwood Park and Silwood Lodge were demolished in 1876 and the present mansion commissioned by Stewart to the design of Alfred Waterhouse , completed in 1878. Stewart was keen on horse racing and partying , and built his new house around a grand ballroom where, on race days and holidays he would entertain the sons of Queen Victoria amongst other racing enthusiasts. Architectural historian Nikolaus Pevsner described
3465-565: Was assessed as 66 per cent world class (4*) 30 per cent internationally important (3*) and 3 per cent internationally recognised (2*), with insignificant quantities of research in lower categories. This led to Imperial being ranked first in the UK on GPA and ninth for research power by Times Higher Education , with a GPA of 3.63 and research power 47.3 per cent of the top-ranked University of Oxford. The college promotes research commercialisation, partly through its dedicated technology transfer company, Imperial Innovations , which has given rise to
3528-464: Was constructed beside the buildings of the Imperial Institute , the new building for the Royal College of Science having opened across from it in 1906, and the foundation stone for the Royal School of Mines building being laid by King Edward VII in July 1909. As students at Imperial had to study separately for London degrees, in January 1919, students and alumni voted for a petition to make Imperial
3591-519: Was formed on 1 October 2007 by the merger of Hammersmith Hospitals NHS Trust ( Charing Cross Hospital , Hammersmith Hospital and Queen Charlotte's and Chelsea Hospital ) and St Mary's NHS Trust ( St. Mary's Hospital and Western Eye Hospital ) with Imperial College London Faculty of Medicine. It is an academic health science centre and manages five hospitals: Charing Cross Hospital , Queen Charlotte's and Chelsea Hospital , Hammersmith Hospital , St Mary's Hospital , and Western Eye Hospital . The Trust
3654-565: Was founded in November 1975 with the intention of broadcasting to the student halls of residence from a studio under Southside, actually commencing broadcasts in late 1976. It now broadcasts from the West Basement of Beit Quad over the internet . Criticality (status) Criticality is the normal operating condition of a nuclear reactor, in which nuclear fuel sustains a fission chain reaction . A reactor achieves criticality (and
3717-469: Was known as Eastmore and was situated on the hill near Silwood Farm. In about 1788, Sir James Sibbald built a neo-classical Georgian mansion by architect Robert Mitchell (1770-1809) on part of the present house and demolished the old "Eastmore"; he called it Selwood or Silwood Park . The name stems from the Old English for Sallow ( Salix caprea Agg.) which presumably grew then along the banks of
3780-554: Was merged in 1853 into what became known as the Royal School of Mines . The medical school has roots in many different schools across London, the oldest of which being Charing Cross Hospital Medical School which can be traced back to 1823, followed by teaching starting at Westminster Hospital in 1834, and St Mary's Hospital in 1851. In 1851, the Great Exhibition was organised as an exhibition of culture and industry by Henry Cole and by Prince Albert, husband of
3843-461: Was suspended in 2012, causing faculty to move their work to Harper Adams University . 51°24′31″N 0°38′28″W / 51.4086°N 0.6410°W / 51.4086; -0.6410 Imperial College London Imperial College London ( Imperial ) is a public research university in London, England. Its history began with Queen Victoria's husband, Prince Albert , who envisioned
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#17327980745353906-669: Was the centre for the LUBILOSA Programme, where an inter-disciplinary team could be set up, combining IIBCs biological control skills with (bio) pesticide application ( IPARC ) and host-pathogen ecology (CPB). CABI continued to focus on biological pest, disease and weed management in Silwood Park until consolidation at Egham (to become the UK Centre) in 2008. The celebrated Entomology Masters in Science (Msc) course
3969-400: Was the oldest of the institutions that united to form Imperial College. "Commemoration Day", named after this visit, is held every October as the university's main graduation ceremony. The college also acquired a biology field station at Silwood Park near Ascot, Berkshire in 1947 Following World War II , there was again concern that Britain was falling behind in science – this time to
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