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| Conversion from | to | Formula |
|---|---|---|
| Fahrenheit | Celsius | °C = (°F − 32) / 1.8 |
| Celsius | Fahrenheit | °F = °C × 1.8 + 32 |
| Fahrenheit | kelvin | K = (°F + 459.67) / 1.8 |
| kelvin | Fahrenheit | °F = K × 1.8 − 459.67 |
| Additional conversion formulas Conversion calculator for units of temperature | ||
Fahrenheit is a temperature scale named after the German physicist Gabriel Fahrenheit ( 1686– 1736), who proposed it in 1724.
In this scale, the freezing point of water is 32 degrees Fahrenheit (this is written "32 °F"), and the boiling point is 212 degrees, placing the boiling and melting points of water 180 degrees apart. Thus the unit of this scale, a degree Fahrenheit, is 5/9ths of a kelvin (or of a degree Celsius), and −40 degrees Fahrenheit is equal to −40 degrees Celsius.
Fahrenheit established the zero of his scale (0 °F) as the temperature at which an equal mixture of iceIce is the solid form of water. The phase transition occurs when liquid water is cooled below 0 °C (273. 15 K, 32 °F) at standard atmospheric pressure. Ice can be formed at higher temperatures in pressurized environments, and water will remain a liquid or and saltProperties General Name Sodium chloride Chemical formula Na Cl Appearance White or clear solid CAS-number 7647-14-5 Physical Formula weight 58. 4 amu Melting point 1074 K (801 °C) Boiling point 1738 K (1465 °C) Density 2. 2 ×103 kg/ m3 Crystal structure f 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's blood to calibrate his scale). Initially, his scale had only contained 12 equal subdivisions, but then later he subdivided each division into 8 equal degrees ending up with 96. He then observed that plain water would freeze at 32 degrees and boil at 212 degrees.
His measurements were not entirely accurate, though; by his original scale, the actual freezing 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 being the actual freezing and boiling points of plain water. This resulted in the healthy human body temperature being 98.6 °F degrees rather than 96 °F.
The Fahrenheit scale was widely used in many English-speaking countries until the Celsius (formerly centigrade) scale was adopted in the late 1960sCenturies: 19th century 20th century 21st century Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s Years: 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 Events and trends The 1960s was a turbulent decade of change around and 1970sMillennia: 1st millennium 2nd millennium 3rd millennium Centuries: 19th century 20th century 21st century Decades: 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s Years: 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 Events and trends. In the United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in and JamaicaThis article is about the country. For others uses, see Jamaica (disambiguation). Jamaica is a country in the Caribbean Sea, located south of Cuba and to the west of Hispaniola, on which Haiti and the Dominican Republic are situated. Jamaica ( In Detail), Fahrenheit continues to be used by the general population for everyday, non-scientific temperature measurement. Conversion between the two scales is given by the formula °C = (5/9)(°F−32), where °C and °F are the Celsius and Fahrenheit temperatures, respectively.