Definition:Kelvin

Definition
The kelvin is the SI base unit of temperature.

Its two reference points are:
 * $0 \ \mathrm K$, which is set at absolute zero, the temperature at which all thermal motion stops
 * $273 \cdotp 16 \ \mathrm K$, which is set at the of water.

Symbol
The symbol for the kelvin is $\mathrm K$.

Note that, unlike the symbols for other temperature scales, there is no degree symbol used here: ${}^\circ \mathrm K$ is technically incorrect.