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16-September-2008 16:15:08 - Fahrenheit For other uses, see Fahrenheit disambiguation. This article or section has multiple issues. Please help improve the article or discuss these issues on the talk page. It needs additional references or sources for verification. Tagged since August 2007. It may require general cleanup to meet 's quality standards. Tagged since March 2008. Fahrenheit temperature conversion formulae from Fahrenheit to Fahrenheit Celsius °C = °F - 32 × 5â?„9 °F = °C × 9â?„5 + 32 Kelvin K = °F + 459.67 × 5â?„9 °F = K × 9â?„5 - 459.67 Rankine °R = °F + 459.67 °F = °R - 459.67 For temperature intervals rather than specific temperatures, 1 °F = 1 °R = 5â?„9 °C = 5â?„9 K Comparisons among various temperature scales Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit 1686-1736, a German physicist who proposed it in 1724. In this scale, the freezing point of water is 32 degrees Fahrenheit °F and the boiling point 212 °F, placing the boiling and freezing points of water exactly 180 degrees apart. A degree on the Fahrenheit scale is 1/180th part of interval between the ice point and steam point or boiling point. On the Celsius scale, the freezing and boiling points of water are exactly 100 degrees apart, hence the unit of this scale. A temperature interval of one degree Fahrenheit is an interval of 5â?„9 of a degree Celsius. The Fahrenheit and Celsius scales coincide at -40 degrees i.e. -40 °F and -40 °C describe the same temperature. Absolute zero is -459.67 °F. The Rankine temperature scale was created to use degrees the same size as those of the Fahrenheit scale, such that a temperature difference of one degree Rankine 1 °R is the same as a temperature difference of 1 °F, but with absolute zero being 0 °R. Contents 1 History 2 Usage 3 The special Unicode ℉ character 4 Temperatures and intervals 5 See also 6 References History According to Fahrenheit himself in an article he wrote in 1724,1 he determined his scale by reference to three fixed points of temperature. The zero point is determined by placing the thermometer in a mixture of ice, water, and ammonium chloride, a salt. This is a type of frigorific mixture. The mixture automatically stabilizes its temperature at 0 °F. He then put an alcohol or mercury thermometer into the mixture and let the liquid in the thermometer descend to its lowest point. The second point is the 32nd degree found by putting the thermometer in still water as ice is just forming on the surface.2 His third point, the 96th degree, was the level of the liquid in the thermometer when held in the mouth or under the armpit. Fahrenheit noted that, using this scale, mercury boils at around 600 degrees. Later work by other scientists observed that water boils about 180 degrees higher than the freezing point and decided to redefine the degree slightly to make it exactly 180 degrees higher1. It is for this reason that normal body temperature is 98.6 on the revised scale whereas it was 96 on Fahrenheit's original scale.3 According to a letter Fahrenheit wrote to his friend Herman Boerhaave,4 his scale built on the work of Ole Rømer, whom he had met earlier. In Rømer's scale, the two fixed reference points are that brine also freezes at 0 degrees and water boils at 60 degrees. He observed that, on this scale, water freezes at 7.5 degrees. Fahrenheit multiplied each value by four in order to eliminate the fractions and increase the granularity of the scale resulting in 30 and 240 degrees. He then re-calibrated his scale between the freezing point of water and normal human body temperature which he observed to be 96 degrees; he adjusted the scale so that the melting point of ice would be 32 degrees, so that 64 intervals would separate the two, allowing him to mark degree lines on his instruments by simply bisecting the interval six times since 64 is 2 to the sixth power.5 Usage The Fahrenheit scale was the primary temperature standard for climatic, industrial and medical purposes in most English-speaking countries until the 1960s. In the late 1960s and 1970s, the Celsius formerly Centigrade scale was phased in by governments as part of the standardizing process of metrication. Only in the United States and a few other countries such as Belize6 does the Fahrenheit system continue to be the accepted standard for non-scientific use. Most other countries have adopted Celsius as the primary scale in all use. Fahrenheit is sometimes used by older generations in English speaking countries, especially for measurement of higher temperatures and for cooking.citation needed The special Unicode ℉ character The Fahrenheit symbol has its own Unicode character: ℉ U+2109. This is a compatibility character encoded for roundtrip compatibility with legacy CJK encodings which included it to conform to layout in square ideographic character cells and vertical layout. Use of compatibility characters is discouraged by the Unicode Consortium. The ordinary degree sign U+00B0 followed by the Latin letter F °F is thus the preferred way of recording the symbol for degree Fahrenheit. Temperatures and intervals As with the Celsius scale, the same symbol, °, is used to denote both a point on the temperature scale, with a letter C, F indicating which scale is being used e.g. Gallium melts at 85.5763 °F and to denote a difference between temperatures or an uncertainty of temperature e.g. The output of the heat exchanger is hotter by 72 °C, and Our standard uncertainty is ±5.4 °C. See also Comparison of temperature scales References ^ a b Fahrenheit temperature scale. Sizes, Inc 2006-12-10. Retrieved on 2008-05-09. ^ Heath, Jonathan. Why does the Fahrenheit scale use 32 degrees as a freezing point?. PhysLink. Retrieved on 2008-05-09. ^ Elert, Glenn, Temperature of a Healthy Human Body Temperature, http://hypertextbook.com/facts/LenaWong.shtml. Retrieved on 4 December 2008 . ^ Ernst Cohen and W. A. T. Cohen-De Meester. Chemisch Weekblad, volume 33 1936, pages 374-393, cited and translated in http://www.sizes.com:80/units/temperature_Fahrenheit.htm ^ Cecil Adams. On the Fahrenheit scale, do 0 and 100 have any special significance?. The Straight Dope. ^ Belize Weather Bureau. Retrieved on 2008-05-09. Look up Fahrenheit in Wiktionary, the free dictionary. v d e Temperature scales Celsius · Fahrenheit · Kelvin · Rankine · Delisle · Leiden · Newton · Réaumur · Rømer Conversion formulas Retrieved from http://en..org/wiki/Fahrenheit Categories: Imperial units | Units of temperatureHidden categories: Articles lacking reliable references from August 2007 | March 2008 | All pages needing cleanup | All articles with statements | Articles with statements since March 2008 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages العربية AzÉ™rbaycan БеларуÑ?каÑ? тарашкевіца БългарÑ?ки Català Česky Dansk Deutsch Eesti Español Esperanto Euskara Ù?ارسی Français Galego í•œêµì–´ Hrvatski Bahasa Indonesia Interlingua Italiano עברית Magyar Bahasa Melayu Nederlands ‪Norsk bokmÃ¥l‬ ‪Norsk nynorsk‬ Polski Português РуÑ?Ñ?кий Simple English SlovenÄ?ina SlovenÅ¡Ä?ina СрпÑ?ки / Srpski Suomi Svenska தமிழà¯? ไทย Tiếng Việt Türkçe اردو å?´è¯ ייִדיש 粵語 ä¸æ–‡ This page was last modified on 15 August 2008, at 17:52
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