Celsiusĭefinition: The Celsius (symbol: ☌) is an SI (International System of Units) derived unit of temperature. Unlike the Celsius and Fahrenheit, the kelvin is not used in meteorological contexts. This is partially due to the kelvin and the Celsius degree having exactly the same magnitude. This definition came about in 1954, when the General Conference on Weights and Measures designated the triple point of water as the second defining point of the Kelvin scale, defining the temperature as exactly 273.16 K.Īlthough the definition of the kelvin has changed fundamentally in 2019, it does not affect how the kelvin is used, or its relationship to other temperature scales and units.Ĭurrent use: The kelvin is used worldwide, particularly in science and engineering, together with the Celsius. Until late 2018, the kelvin was defined as 1/273.16 of the thermodynamic temperature of the triple point of water (0.01☌ or 32.018☏). He calculated the value of absolute zero to be -273☌ in 1848 which is only a 0.15☌ deviation from the current accepted value. Thomson wrote a paper outlining the need for an absolute temperature scale. History/origin: The kelvin is named after British physicist William Thomson, who was known as Lord Kelvin. This new definition results in a fundamental change in the kelvin, such that it is now dependent on the definitions of the second, the meter, and the kilogram. The definition of the kelvin was changed in 2019. It is also the unit of the Kelvin scale in which the null point (0 K) is the temperature at which all thermal motion ceases, known as absolute zero, or -273.15☌. It is defined as the energy equivalent of the triple point of water as given by Boltzmann's equation. Definition: The kelvin (symbol: K) is the base unit of thermodynamic temperature in the International System of Units (SI).
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