| from Fahrenheit | to Fahrenheit | |
|---|---|---|
| Celsius | [°C] = ([°F] − 32) × 5⁄9 | [°F] = [°C] × 9⁄5 + 32 |
| Kelvin | [K] = ([°F] + 459. The Celsius Temperature scale was previously known as the centigrade scale. The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic 67) × 5⁄9 | [°F] = [K] × 9⁄5 − 459. 67 |
| Rankine | [°R] = [°F] + 459. Rankine is a thermodynamic (absolute temperature scale named after the Scottish Engineer and Physicist William John Macquorn Rankine 67 | [°F] = [°R] − 459. 67 |
| For temperature intervals rather than specific temperatures, 1 °F = 1 °R and 1 °F = 5⁄9 °C Comparisons among various temperature scales |
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Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit (1686–1736), the German physicist who proposed it in 1724. Kelvin Celsius (Centigrade Fahrenheit Rankine Delisle Newton Réaumur Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe. A physicist is a Scientist who studies or practices Physics. Physicists study a wide range of physical phenomena in many branches of physics spanning
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. Water is a common Chemical substance that is essential for the survival of all known forms of Life. The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid 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, thus the unit of this scale. The Celsius Temperature scale was previously known as the centigrade scale. A temperature interval of one degree Fahrenheit is an interval of 5⁄9 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. Absolute zero is the point at which molecules do not move (relative to the rest of the body more than they are required to by a quantum mechanical effect called Zero-point 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. Rankine is a thermodynamic (absolute temperature scale named after the Scottish Engineer and Physicist William John Macquorn Rankine
Contents |
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. The thermometer is a device that measures Temperature or Temperature gradient using a variety of different principles it comes from the Greek roots Ice is a Solid phase, usually crystalline, of a Non-metalic substance that is liquid or gas at Room temperature, such as Ammonia Ammonium chloride ( N[[Hydrogen H]]4 Cl) (also Sal Ammoniac, salmiac, nushadir salt, zalmiak, sal armagnac This is a type of frigorific mixture. A frigorific mixture is a mixture of two or more chemicals that achieve an equilibrium temperature independent of the temperature that the two chemicals started at 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[1] It is for this reason that normal body temperature is 98. 6 on the revised scale (whereas it was 96 on Fahrenehit'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. Ole Christensen Rømer (o(ːlə ˈʁœːˀmɐ in Danish 25 September 1644, Århus – 19 September 1710, Copenhagen) In Rømer’s scale, the two fixed reference points are that brine also freezes at 0 degrees and water boils at 60 degrees. Rømer is a disused Temperature scale named after the Danish Astronomer Ole Christensen Rømer, who proposed it in 1701. 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. The Celsius Temperature scale was previously known as the centigrade scale. Metrication (or metrification refers to the introduction of the SI metric system as the International standard for physical measurements—a long-term series Only 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. The United States of America —commonly referred to as the Belize (bəˈliːz formerly British Honduras, is a country in Central America. 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.
The special Unicode “℉” character
The Fahrenheit symbol has its own Unicode character: “℉” (U+2109). In Computing, Unicode is an Industry standard allowing Computers to consistently represent and manipulate text expressed in most of the world's 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. In discussing Unicode and the UCS many often refer to compatibility characters CJK is a collective term for Chinese, Japanese, and Korean, which constitute the main East Asian languages. An ideogram or ideograph (from Greek idea "idea" + grafo "to write" is a Graphic symbol that represents an Idea 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. The Celsius Temperature scale was previously known as the centigrade scale. g. “Gallium melts at 85. Gallium (ˈgæliəm is a Chemical element that has the symbol Ga and Atomic number 31 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
References
- ^ a b Fahrenheit temperature scale. Sizes, Inc (2006-12-10). Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1041 - Empress Zoe of Byzantium elevates her adoptive son to the throne of the Eastern Roman Empire as Michael V Retrieved on 2008-05-09. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1457 BC - Battle of Megiddo (15th century BC between Thutmose III and a large Canaanite coalition under the King of
- ^ Heath, Jonathan. Why does the Fahrenheit scale use 32 degrees as a freezing point?. PhysLink. Retrieved on 2008-05-09. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1457 BC - Battle of Megiddo (15th century BC between Thutmose III and a large Canaanite coalition under the King of
- ^ 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. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1457 BC - Battle of Megiddo (15th century BC between Thutmose III and a large Canaanite coalition under the King of
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