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Cryogenics

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metallurgically significant about ambient temperature. The cryogenic process continues this action from ambient temperature down to −320 °F (140 °R; 78 K; −196 °C). In most instances the cryogenic cycle is followed by a heat tempering procedure. As all alloys do not have the same chemical constituents, the tempering procedure varies according to the material's chemical composition, thermal history and/or a tool's particular service application.
525: 49: 66: 840:(NMR) is one of the most common methods to determine the physical and chemical properties of atoms by detecting the radio frequency absorbed and subsequent relaxation of nuclei in a magnetic field. This is one of the most commonly used characterization techniques and has applications in numerous fields. Primarily, the strong magnetic fields are generated by supercooling electromagnets, although there are 962: 694: 572:, which are double-walled containers with a high vacuum between the walls to reduce heat transfer into the liquid. Typical laboratory Dewar flasks are spherical, made of glass and protected in a metal outer container. Dewar flasks for extremely cold liquids such as liquid helium have another double-walled container filled with liquid nitrogen. Dewar flasks are named after their inventor, 455: 38: 96:'s (IIR) International Congress of Refrigeration (held in Washington DC in 1971) endorsed a universal definition of "cryogenics" and "cryogenic" by accepting a threshold of 120 K (−153 °C) to distinguish these terms from the conventional refrigeration. This is a logical dividing line, since the normal 143:
materials with critical temperatures significantly above the boiling point of nitrogen has provided new interest in reliable, low-cost methods of producing high-temperature cryogenic refrigeration. The term "high temperature cryogenic" describes temperatures ranging from above the boiling point of
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by overhead cables, so underground cables are used. But underground cables get heated and the resistance of the wire increases, leading to waste of power. Superconductors could be used to increase power throughput, although they would require cryogenic liquids such as nitrogen or helium to cool
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Cryogenic processing is not a substitute for heat treatment, but rather an extension of the heating–quenching–tempering cycle. Normally, when an item is quenched, the final temperature is ambient. The only reason for this is that most heat treaters do not have cooling equipment. There is nothing
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that do not require cryogens. In traditional superconducting solenoids, liquid helium is used to cool the inner coils because it has a boiling point of around 4 K at ambient pressure. Cheap metallic superconductors can be used for the coil wiring. So-called high-temperature superconducting
851:(MRI) is a complex application of NMR where the geometry of the resonances is deconvoluted and used to image objects by detecting the relaxation of protons that have been perturbed by a radio-frequency pulse in the strong magnetic field. This is most commonly used in health applications. 883:. When very large quantities of food must be transported to regions like war zones, earthquake hit regions, etc., they must be stored for a long time, so cryogenic food freezing is used. Cryogenic food freezing is also helpful for large scale food processing industries. 52:
This is a diagram of an infrared space telescope, that needs a cold mirror and instruments. One instrument needs to be even colder, and it has a cryocooler. The instrument is in region 1 and its cryocooler is in region 3 in a warmer region of the spacecraft (see
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are in wide use with selection based on required base temperature and cooling capacity. The most recent development in cryogenics is the use of magnets as regenerators as well as refrigerators. These devices work on the principle known as the
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The conservation of genetic material with the intention of conserving a breed. The conservation of genetic material is not limited to non-humans. Many services provide genetic storage or the preservation of
1149:"Cryogenics is usually defined as the science and technology dealing with temperatures less than about 120 K , although this review does not adhere to a strict 120 K definition." K.D. Timmerhaus, R. Reed. 634:
called CryoTech in 1966. Busch originally experimented with the possibility of increasing the life of metal tools to anywhere between 200% and 400% of the original life expectancy using
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on July 10, 1908. The discovery came after the ability to reach a temperature of 2 K. These first superconductive properties were observed in mercury at a temperature of 4.2 K.
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The branches of engineering that involve the study of very low temperatures (ultra low temperature i.e. below 123 K), how to produce them, and how materials behave at those temperatures.
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By freezing the automobile or truck tire in liquid nitrogen, the rubber is made brittle and can be crushed into small particles. These particles can be used again for other items.
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liquid nitrogen, −195.79 °C (77.36 K; −320.42 °F), up to −50 °C (223 K; −58 °F). The discovery of superconductive properties is first attributed to
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J. M. Nash, 1991, "Vortex Expansion Devices for High Temperature Cryogenics", Proc. of the 26th Intersociety Energy Conversion Engineering Conference, Vol. 4, pp. 521–525.
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The field of cryogenics advanced during World War II when scientists found that metals frozen to low temperatures showed more resistance to wear. Based on this theory of
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Experimental research on certain physics phenomena, such as spintronics and magnetotransport properties, requires cryogenic temperatures for the effects to be observable.
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special alloy-containing cables to increase power transmission. Several feasibility studies have been performed and the field is the subject of an agreement within the
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The branch of surgery applying cryogenic temperatures to destroy and kill tissue, e.g. cancer cells. Commonly referred to as Cryoablation.
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Cryogenic barcode labels are used to mark Dewar flasks containing these liquids, and will not frost over down to −195 degrees Celsius.
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are used to remove reaction heat and provide a low temperature environment. The freezing of foods and biotechnology products, like
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Radebaugh, R. (2007), Timmerhaus, Klaus D.; Reed, Richard P. (eds.), "Historical Summary of Cryogenic Activity Prior to 1950",
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humans and animals with the intention of future revival. "Cryogenics" is sometimes erroneously used to mean "Cryonics" in
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In terms of the Kelvin scale the cryogenic region is often considered to be that below approximately 120 K (−153 C).
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drugs, must occur at low temperatures of approximately −100 °C (−148 °F). Special cryogenic
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use cryogenic gases as propellants. These include liquid oxygen, liquid hydrogen, and liquid methane.
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effect systems to create a chilling effect and white fog that can be illuminated with colored lights.
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compounds can be made to super conduct with the use of liquid nitrogen, which boils at around 77 K.
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Certain rare blood groups are stored at low temperatures, such as −165°C, at blood banks.
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which measures from the freezing point of a particular brine solution at sea level.
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must be stored at temperatures of −90 to −60 °C (−130 to −76 °F). (See
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used cryogenic hydrogen/oxygen propellant as its primary means of getting into
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The study of electronic phenomena at cryogenic temperatures. Examples include
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Cryogenic cooling of devices and material is usually achieved via the use of
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https://www.ashrae.org/technical-resources/free-resources/ashrae-terminology
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kerosene, a non-cryogenic hydrocarbon, such as in the rockets built for the
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industry was founded in 1966 by Bill and Ed Busch. With a background in the
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Cryogenic cooling is used to cool the tool tip at the time of machining in
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Study of the production and behaviour of materials at very low temperatures
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Cryogenic gases are used in transportation and storage of large masses of
1371:"Cryopreservation of Human Stem Cells for Clinical Application: A Review" 767: 646: 595: 577: 535: 257: 198: 117: 109: 27: 1518:. Jefferson, North Carolina: McFarland & Company, Inc. p. 227. 220:
at birth. They may be used to study the generation of cell lines or for
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is being filled with liquid nitrogen by a larger cryogenic storage tank.
1066:, are used. For temperatures lower than 30 K, it is necessary to use a 936: 798: 662: 658: 631: 581: 479: in this section. Unsourced material may be challenged and removed. 194: 164: 78: 1386: 1034:(which uses high-pressure helium lines). Gifford-McMahon cryocoolers, 136:, and other common refrigerants have boiling points above 120 K. 1062:
For cryogenic temperature measurement down to 30 K, Pt100 sensors, a
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which measures from the freezing point of water at sea level or
113: 19:"Low temperature physics" redirects here. For the journal, see 955: 687: 448: 125: 101: 1260:"Observationer om twänne beständiga grader på en thermometer" 890:) cameras require their detectors to be cryogenically cooled. 939:
must be stored at cryogenic temperatures. For example, the
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involving the study of the effects of low temperatures on
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is the production and behaviour of materials at very low
1266:(Proceedings of the Royal Swedish Academy of Sciences), 1321:"Fahrenheit: Facts, History & Conversion Formulas" 1310:, Encyclopædia Britannica Online. 25 September 2015 829:are equipped with continuous-flow cooling systems. 630:industry, the Busch brothers founded a company in 871:Cryogenic gases delivery truck at a supermarket, 1264:Kungliga Svenska Vetenskapsakademiens Handlingar 665:at very low temperatures, which makes cryogenic 594:Cryogenic transfer pumps are the pumps used on 1151:Cryogenic Engineering: Fifty Years of Progress 530:Cryogenic valves in situ, heavily frozen from 159:temperature scale, both of which measure from 301:Cryogenic fluids with their boiling point in 8: 211:Cryoconservation of animal genetic resources 1118:International Dictionary of Refrigeration, 990:. Unsourced material may be challenged and 813:or LNG, and made its first flight in 1989. 805:with a cryogenic fuel system, known as the 722:. Unsourced material may be challenged and 801:developed a version of its popular design 1394: 1234: 1010:Learn how and when to remove this message 766:(LOX) is even more widely used but as an 742:Learn how and when to remove this message 495:Learn how and when to remove this message 201:(most often for the purpose of achieving 1444:"Cryonics is NOT the Same as Cryogenics" 809:. The plane uses a fuel referred to as 307: 163:, rather than more usual scales such as 94:International Institute of Refrigeration 1120:http://dictionary.iifiir.org/search.php 1111: 1064:resistance temperature detector (RTD) 7: 1472:CRYOGENIC SYSTEMS BY RANDALL BARRON 1375:Transfusion Medicine and Hemotherapy 1181:"DICHLORODIFLUOROMETHANE at Pubchem" 1085:Lowest temperature recorded on Earth 1059:which are used to detect particles. 988:adding citations to reliable sources 854:In large cities, it is difficult to 720:adding citations to reliable sources 518:Catalogue image of a cryogenic valve 477:adding citations to reliable sources 44:under −195.8 °C (77.3 K). 26:For cryopreservation of humans, see 680:The entire process takes 3–4 days. 546:Low-temperature technology timeline 128:) lie below 120 K, while the 14: 1587:. Pfizer-BioNTech. Archived from 833:Some applications of cryogenics: 762:as the most widely used example. 21:Low Temperature Physics (journal) 960: 941:Pfizer–BioNTech COVID-19 vaccine 825:Astronomical instruments on the 692: 523: 511: 453: 1369:Hunt, Charles (April 3, 2011). 782:. LOX is also widely used with 588:fitted in a protective casing. 568:These liquids may be stored in 464:needs additional citations for 797:Russian aircraft manufacturer 576:, the man who first liquefied 563:lowest attainable temperatures 55:MIRI (Mid-Infrared Instrument) 1: 1419:"Cryosurgery to Treat Cancer" 1350:www.societyforcryobiology.org 754:Another use of cryogenics is 1617:, Academic Press, New York, 1448:Cryogenic Society of America 1308:Fahrenheit temperature scale 896:Cryogenics technology using 175:Definitions and distinctions 1285:; Ronald A. Bailey (2005): 861:International Energy Agency 610:, as are cryogenic valves. 100:of the so-called permanent 1665: 1288:Encyclopedia of Chemistry. 849:Magnetic resonance imaging 838:Nuclear magnetic resonance 543: 59:James Webb Space Telescope 25: 18: 645:Cryogens, such as liquid 1613:Haselden, G. G. (1971), 1515:Refrigeration: A History 1474:McGraw-Hill Book Company 888:forward looking infrared 1512:Gantz, Carroll (2015). 1298:, New York City. p. 43. 1258:Celsius, Anders (1742) 1236:10.1007/0-387-46896-x_1 445:Industrial applications 146:Heike Kamerlingh Onnes 1615:Cryogenic fundamentals 1544:www.globalsecurity.org 1346:"What is Cryobiology?" 1036:pulse tube cryocoolers 875: 830: 250:variable-range hopping 151:Cryogenicists use the 74: 62: 45: 1219:Cryogenic Engineering 1032:mechanical cryocooler 913:manufacturing process 870: 824: 811:liquefied natural gas 600:liquefied natural gas 544:Further information: 68: 51: 40: 1195:"PROPANE at Pubchem" 1137:ASHRAE Terminology, 1040:Stirling cryocoolers 984:improve this section 904:has been built into 827:Very Large Telescope 788:Soviet space program 716:improve this section 624:cryogenic processing 614:Cryogenic processing 584:bottles are smaller 473:improve this article 305:and degree Celsius. 42:Nitrogen is a liquid 30:. For the band, see 1227:2007cren.book....3R 1057:cryogenic detectors 873:Ypsilanti, Michigan 636:cryogenic tempering 620:cryogenic hardening 317:Boiling point (°C) 1644:Cooling technology 1591:on 24 January 2021 1488:"Cryogenic Labels" 1454:on 2 December 2018 1164:"About Cryogenics" 1125:2019-10-01 at the 1090:Cryogenic grinding 1055:There are various 876: 831: 817:Other applications 75: 63: 46: 1540:"Tu-155 / Tu-156" 1525:978-0-7864-7687-9 1387:10.1159/000326623 1246:978-0-387-46896-9 1020: 1019: 1012: 758:for rockets with 752: 751: 744: 655:chemical reactors 622:, the commercial 608:LNG storage tanks 505: 504: 497: 442: 441: 314:Boiling point (K) 246:superconductivity 222:stem-cell therapy 1656: 1649:Industrial gases 1601: 1600: 1598: 1596: 1581: 1575: 1574: 1572: 1570: 1560: 1554: 1553: 1551: 1550: 1536: 1530: 1529: 1509: 1503: 1502: 1500: 1498: 1486:Thermal, Timmy. 1483: 1477: 1470: 1464: 1463: 1461: 1459: 1450:. 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Index

Low Temperature Physics (journal)
Cryonics
Cryogenic (band)

Nitrogen is a liquid

MIRI (Mid-Infrared Instrument)
James Webb Space Telescope

dewar
physics
temperatures
International Institute of Refrigeration
boiling points
gases
helium
hydrogen
neon
nitrogen
oxygen
air
Freon
hydrocarbons
superconducting
Heike Kamerlingh Onnes
Kelvin
Rankine
absolute zero
Celsius
Fahrenheit

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