kelvin (K)

Document v1 · published by Koskamo · updated 2026-10-05

The kelvin (symbol K) is the SI base unit of thermodynamic temperature, per the BIPM SI Reference Point.

Name: kelvin
Symbol: K
Unit type: SI base unit
Quantity kind: thermodynamic temperature
Definition (status current, in force since 2019-05-20): The kelvin, symbol $\rm{K}$, is the SI unit of thermodynamic temperature. It is defined by taking the fixed numerical value of the Boltzmann constant, ${k}$, to be $1.380\:649 \times 10^{-23}$ when expressed in the unit ${\rm{J}}\ {\rm{K}}^{-1}$, which is equal to ${\rm{kg}}\ {\rm{m}}^{2}\ {\rm{s}}^{-2}\ {\rm{K}}^{-1}$, where the kilogram, metre and second are defined in terms of ${h}$, $c$ and $\Delta\nu_{\rm{Cs}}$.
Defining constant: Boltzmann constant (fixed numerical value 1.380 649 x 10⁻²³)
Defining equation: 1\;{\rm{K}} = \left(\frac{1.380\:649 \times 10^{-23}}{{k}}\right) {\rm{kg}}\;{\rm{m}}^2\;{\rm{s}}^{-2}
Defining resolution: https://si-digital-framework.org/bodies/CGPM#CGPM26-Res1
Superseded definitions: kelvin1967 (1967-10-13 to 2019-05-19)

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Original source: si-digital-framework.org
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: BIPM SI Reference Point (si-digital-framework.org), the SI defining constants, base and derived units, and prefixes; CC BY 3.0 IGO

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The kelvin (symbol K) is the SI base unit of thermodynamic temperature, per the BIPM SI Reference Point.

- Name: kelvin
- Symbol: K
- Unit type: SI base unit
- Quantity kind: thermodynamic temperature
- Definition (status current, in force since 2019-05-20): The kelvin, symbol $\rm{K}$, is the SI unit of thermodynamic temperature. It is defined by taking the fixed numerical value of the Boltzmann constant, ${k}$, to be $1.380\:649 \times 10^{-23}$ when expressed in the unit ${\rm{J}}\ {\rm{K}}^{-1}$, which is equal to ${\rm{kg}}\ {\rm{m}}^{2}\ {\rm{s}}^{-2}\ {\rm{K}}^{-1}$, where the kilogram, metre and second are defined in terms of ${h}$, $c$ and $\Delta\nu_{\rm{Cs}}$.
- Defining constant: Boltzmann constant (fixed numerical value 1.380 649 x 10⁻²³)
- Defining equation: 1\;{\rm{K}} = \left(\frac{1.380\:649 \times 10^{-23}}{{k}}\right) {\rm{kg}}\;{\rm{m}}^2\;{\rm{s}}^{-2}
- Defining resolution: https://si-digital-framework.org/bodies/CGPM#CGPM26-Res1
- Superseded definitions: kelvin1967 (1967-10-13 to 2019-05-19)

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Published by Koskamo2026-10-05
Version 1