kelvin

Also known as K, Kelvin degrees, degrees Kelvin, °K

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Key facts

Unit.name: kelvin
Unit.image: Temperature-scales-comparison.svgclass=skin-invert-image
Unit.caption: Equivalent temperatures in the Kelvin (K), Celsius (°C), and Fahrenheit (°F) scales
Unit.standard: SI
Unit.quantity: temperature
Unit.symbol: K
Unit.namedafter: William Thomson, 1st Baron Kelvin
Unit.conversionslink: Conversions
Unit.convertfromx: yes
Unit.units1: Celsius
Unit.inunits1:  °C
Unit.units2: Fahrenheit
Unit.inunits2:  °F
Unit.units3: Rankine scale
Unit.inunits3:  °Ra
Unit.extralabel: 2019 definition
Unit.extradata: Boltzmann constant| ≝  J/K

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Wikidata facts

Image: CelsiusKelvinThermometer.jpg

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Unicode character: K
conversion to SI unit: 1
Commons category: Kelvin temperature
unit symbol: K
Wikidata SPARQL query equivalent: wd:Q11579 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)

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~18 min read

Article

18 sections

Contents

History
Precursors
Charles's law
Lord Kelvin
First absolute scale
Modern absolute scale
Triple point standard
2019 redefinition
Practical uses
Colour temperature
Kelvin as a unit of noise temperature
Derived units and SI multiples
Orthography
See also
Notes
References
Bibliography
External links

The kelvin (symbol: K) is the base unit for temperature in the International System of Units (SI). The Kelvin scale is an absolute temperature scale that starts at the lowest possible temperature (absolute zero), taken to be 0 K. By definition, the units of the Celsius scale (symbol °C) and the Kelvin scale have the same magnitude (that is, a rise in temperature of one kelvin and a rise of 1 °C are both equal to 1 K), and any temperature in degrees Celsius can be converted to the kelvin scale by adding 273.15.

The 19th-century British scientist Lord Kelvin first developed and proposed the scale. It was often called the "absolute Celsius" scale in the early 20th century. The kelvin was formally added to the International System of Units in 1954, defining 273.16 K to be the temperature of the triple point of water (0.01 °C). The Celsius, Fahrenheit, and Rankine scales were redefined in terms of the Kelvin scale using this definition. The 2019 revision of the SI now defines the kelvin in terms of energy by setting the Boltzmann constant; every 1 K change of thermodynamic temperature corresponds to a change in the thermal energy, , of exactly .