|kelvins||degrees Fahrenheit||Â°F = K × 1.8 − 459.67|
|degrees Fahrenheit||kelvins||K = (Â°F + 459.67) / 1.8|
|kelvins||degrees Celsius||Â°C = K − 273.15|
|degrees Celsius||kelvins||K = Â°C + 273.15|
|Note that for temperature intervals rather than temperature readings,|
1 K = 1 Â°C and 1 K = 1.8 Â°F
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The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. It is defined by two facts: zero kelvins is absolute zero (when molecular motion stops), and one kelvin is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. The Celsius temperature scale is now defined in terms of the kelvin, with 0 Â°C corresponding to 273.15 kelvins, approximately the melting point of water under ordinary conditions.
The kelvin is named after the British physicist and engineer William Thomson, 1st Baron Kelvin.
In Unicode, a legacy code for a kelvin symbol to accommodate some old code pages in certain Oriental languages exists; it is not recommended for use any more. In all languages, the symbol should be the Roman letter Unicode K for current usage.
The word kelvin as an SI unit is correctly written with a lowercase k (unless at the beginning of a sentence), and is never preceded by the words degree or degrees, or the symbol Â°, unlike Fahrenheit, or Celsius. This is because the latter are scales of measurement, whereas the kelvin is a unit of measurement. It takes the normal plural form by adding an s in English: kelvins. When the kelvin was introduced in 1954 (10th ConfÃ©rence GÃ©nÃ©rale des Poids et Mesures|General Conference on Weights and Measures (CGPM), Resolution 3, CR 79), it was the "degree Kelvin", and written °K; the "degree" was dropped in 1967 (13th CGPM, Resolution 3, CR 104).
Note that the symbol for the kelvin unit is always a capital K and never italicised. There is a space between the number and the K, as with all other SI units.