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Encyclopedia > Fahrenheit
Fahrenheit temperature conversion formulae
from Fahrenheit to Fahrenheit
Celsius [℃] = ([°F] − 32) × 59 [°F] = [℃] × 95 + 32
Kelvin [K] = ([°F] + 459.67) × 59 [°F] = [K] × 95 − 459.67
Rankine [°R] = [°F] + 459.67 [°F] = [°R] − 459.67
For temperature intervals rather than specific temperatures,
1 °F = 1 °R
1 °F = 59
Comparisons among various temperature scales

Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit (1686–1736), the German physicist who proposed it in 1724. Fahrenheit may refer to one of the following Gabriel Fahrenheit, a German physicist Fahrenheit, the temperature scale Fahrenheit graphics API 7800 degrees Fahrenheit, an album by Bon Jovi Fahrenheit, a multi format computer game by Quantic Dream Fahrenheit, a computer game for the Sega CD and Sega 32X Fahrenheit 9... Image File history File links Question_book-3. ... Image File history File links Broom_icon. ... For other uses, see Celsius (disambiguation). ... For other uses, see Kelvin (disambiguation). ... For the idealized thermodynamic cycle for a steam engine, see Rankine cycle. ... // Comparison of temperature scales ¹ Normal human body temperature is 36. ... For other uses, see Temperature (disambiguation). ... Daniel Gabriel Fahrenheit, also called Gabriel Daniel Fahrenheit (May 24, 1686 - September 16, 1736), was a physicist and an engineer, who most of his life worked in Netherlands and for whom the Fahrenheit scale of temperature is named. ... Not to be confused with physician, a person who practices medicine. ...

In this scale, the freezing point of water is 32 degrees Fahrenheit (written "32 °F"), the boiling point is 212 degrees, placing the boiling and freezing points of water exactly 180 degrees apart. On the Celsius scale, the freezing and boiling points of water are exactly 100 degrees apart, thus the unit of this scale, a degree Fahrenheit, is 59 of a degree Celsius. The Fahrenheit scale coincides with the Celsius scale at −40 °F, which is the same temperature as −40 °C. Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... Italic text This article is about the boiling point of liquids. ... For other uses, see Celsius (disambiguation). ... The former Weights and Measures office in Middlesex, England. ...

Absolute zero is −459.67 °F. The Rankine temperature scale was invented to use degrees the same size as Fahrenheit degrees, but with absolute zero equal to 0 °R, or −459.67 °F. For other uses, see Absolute Zero (disambiguation). ... For the idealized thermodynamic cycle for a steam engine, see Rankine cycle. ...



There are a few competing versions of the story of how Fahrenheit came to devise his temperature scale. According to Fahrenheit himself in an article he wrote in 1724 [1] he determined three fixed points of temperature. The zero point is determined by placing the thermometer in a mixture of ice, water, and ammonium chloride. This is a type of frigorific mixture. The mixture automatically stabilizes its temperature at zero degrees Fahrenheit (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 mixing ice and water without the salt. 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. This article is about water ice. ... Ammonium chloride (NH4Cl) (also Sal Ammoniac, salmiac, nushadir salt, zalmiak, sal armagnac, sal armoniac, salmiakki, salmiak and salt armoniack) is, in its pure form, a clear white water-soluble crystalline salt of ammonia with a biting, slightly sour taste. ...

Other theories are similar in nature. One states that Fahrenheit established the zero (0 °F) and 96 °F points on his scale by recording the lowest outdoor temperatures he could measure, and his own body temperature. He took the lowest temperature which he measured in the harsh winter of 1708 through 1709 in his hometown of Danzig (now Gdańsk, Poland) (−17.8 °C) as his zero point. (He was later able to reach this temperature under laboratory conditions using a mixture of ice, sodium chloride and water.) Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when temperature surrounding is very different. ... For alternative meanings of Gdańsk and Danzig, see Gdansk (disambiguation) and Danzig (disambiguation) The title given to this article is incorrect due to technical limitations. ...

A variant of this version is that the mixture of ice, salt, and water registered the lowest temperature Fahrenheit could attain in the lab, so he used that for his zero point, using his body temperature as 96 °F.[2]

Fahrenheit wanted to avoid the negative temperatures that the Rømer scale had produced in everyday use. He fixed his own body temperature as 96 °F. (As noted below, the scale has since been re-calibrated so that normal body temperature is closer to 98.6 °F). He then divided his scale into twelve sections, and subsequently each of these into 8 equal subdivisions, producing a scale of 96 degrees. Fahrenheit noted that his scale placed the freezing point of water at 32 °F and the boiling point at 212 °F. Rømer is a disused temperature scale named after the Danish astronomer Ole Christensen Rømer, who proposed it in 1701. ... Normal human body temperature is 36. ...

Another story holds that Fahrenheit established the zero of his scale (0 °F) as the temperature at which an equal mixture of ice and salt melts (some say he took that fixed mixture of ice and salt that produced the lowest temperature); and ninety-six degrees as the temperature of blood (he initially used horse blood to calibrate his scale, as the normal body temperature of horses is 100 °F). Initially, his scale only contained 12 equal subdivisions, but later he subdivided each division into 8 equal degrees ending up with 96.[citation needed] This article is about water ice. ...

A fourth well-known version of the story, as described in the popular physics television series The Mechanical Universe, holds that Fahrenheit simply adopted Rømer’s scale, at which water freezes at 7.5 degrees, and multiplied each value by 4 in order to eliminate the fractions and increase the granularity of the scale (giving 30 and 240 degrees). He then re-calibrated his scale between the freezing point of water and normal human body temperature (which he took to be 96 degrees); the melting point of ice was adjusted to 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).[3] The Mechanical Universe. ... Ole Rømer. ...

A fifth version maintains that Fahrenheit based 0 degrees on an estimate of the temperature at which someone's bare skin would receive frostbite, and 100 degrees on the temperature at which ones blood would boil [4], therefore making 0 to 100 an approximate livable range for human beings. This article is about a medical condition. ...

A sixth version maintains that Fahrenheit marked the melting point of ice, normal human body temperature, and the boiling point of water. He then divided the span from melting to boiling into 180 degrees. Setting the normal human body temperature as 96 resulted in the freezing point and boiling point being 32 and 212, respectively.[citation needed]

A seventh version maintains that the coldest temperature he could achieve in the lab was designated with 0 degrees, and the melting point of butter was 100 degrees.[5]

His measurements were not entirely accurate; by his original scale, the actual melting and boiling points would have been noticeably different from 32 °F and 212 °F. Some time after his death, it was decided to recalibrate the scale with 32 °F and 212 °F as the exact freezing and boiling points of plain water. That change was made to easily convert from Celsius to Fahrenheit and vice versa, with a simple formula. This change also explains why normal human body temperature, once taken as 96 °F by Fahrenheit, is today known to average 98.6 °F. Normal human body temperature is a concept that depends on the place in the body at which the measurement is made. ...


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. In the United States and a few other countries (such as Belize[6]) the Fahrenheit system continues 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] For other uses, see Celsius (disambiguation). ... Metrication or metrification refers to the introduction of the SI metric system as the international standard for physical measurements—a long-term series of independent and systematic conversions from the various separate local systems of weights and measures. ...

The special Unicode °F 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 is thus the preferred way of writing the symbol for degrees Fahrenheit. The Unicode Standard, Version 5. ... In discussing Unicode and the UCS, many often refer to compatibility characters. ... CJK is a collective term for Chinese, Japanese, and Korean, which comprise the main East Asian languages. ... A Chinese character. ...

Temperatures and intervals

As with the kelvin and Celsius scales, the same symbol, °F, is used to denote both a point on the temperature scale (e.g. “Gallium melts at 85.5763 °F”) and to denote differences between temperatures or their uncertainties (e.g. “The output of the heat exchanger is hotter by 72 °F”, and “Our standard uncertainty is ±5.4 °F”). Not to be confused with Galium. ...

See also

There are very few or no other articles that link to this one. ...


External links

Look up Fahrenheit in
Wiktionary, the free dictionary.
Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 151 languages. ... For other uses, see Temperature (disambiguation). ... A scale is either a device used for measurement of weights, or a series of ratios against which different measurements can be compared. ... For other uses, see Celsius (disambiguation). ... For other uses, see Kelvin (disambiguation). ... The Delisle scale is a temperature scale invented in 1732 by the French astronomer Joseph-Nicolas Delisle (1688–1768). ... The Leyden temperature scale could plausibly have been introduced around 1894, when Heike Kamerlingh Onnes cryogenic laboratory was established in Leyden, Netherlands. ... Around 1700, Isaac Newton (1642–1727) applied his mind to the problem of heat. ... For the idealized thermodynamic cycle for a steam engine, see Rankine cycle. ... The degree Réaumur is a unit of temperature named after René Antoine Ferchault de Réaumur, who first proposed it in 1731. ... Rømer is a disused temperature scale named after the Danish astronomer Ole Christensen Rømer, who proposed it in 1701. ... // Ranking to Celsius do not match equations from Celsius table. ...

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