https://doi.org/10.1351/goldbook.K03374
The kelvin, symbol \(\text{K}\), is the SI unit of thermodynamic temperature. It is defined by taking the fixed numerical value of the @B00695@ \(k\) to be \(1.380\ 649\times 10^{-23}\) when expressed in the unit \(\text{J K}^{-1}\), which is equal to \(\pu{kg m2 s-2 K-1}\), where the kilogram, metre and second are defined in terms of @P04685@, @S05854-1@ and @S05854-2@.