Kelvin temperature conversion formulas

Conversion from	to	Formula
kelvins	degrees Fahrenheit	�F = K × 1.8 − 459.67
degrees Fahrenheit	kelvins	K = (�F + 459.67) / 1.8
kelvins	degrees Celsius	�C = K − 273.15
degrees Celsius	kelvins	K = �C + 273.15
Note that for temperature intervals rather than temperature readings, 1 K = 1 �C and 1 K = 1.8 �F Additional conversion formulas Conversion calculator for units of temperature (http://www.chemie.fu-berlin.de/chemistry/general/units_en.html#temp)

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 �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 accomodate 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.

Typographical conventions

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 �, 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 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.

Conversion factors

In a thermodynamic system, the energy carried by the particles is proportional to the absolute temperature, where the constant of proportionality is the Boltzmann constant. As a result, it is possible to determine the temperature of particles with a certain energy; or to calculate the energy of particles at a certain temperature:

electron volts to kelvins

<math>\mathrm{eV} \times 11,\!605<math>

kelvins to electron volts

<math>\frac{\mathrm{K}}{11,\!605}<math>

External link

• BIPM brochure on the kelvin (http://www1.bipm.org/en/si/si_brochure/chapter2/2-1/2-1-1/kelvin.html)

Temperature scales

kelvin | Celsius | Fahrenheit

Disused scales

Delisle | Leyden | Newton | Rankine | R�aumur | R�mer

Temperature conversion formulas

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