## SI base quantity: temperature

This category of measurement units is defined by the
"temperature" type, which is an SI base quantity.

## SI unit: kelvin

The SI base unit for temperature is the kelvin.

## Definition: Kelvin

The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. It is defined by two facts: zero kelvins is absolute zero (when molecular motion stops), and one kelvin is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. The Celsius temperature scale is now defined in terms of the kelvin, with 0 °C corresponding to 273.15 kelvins, approximately the melting point of water under ordinary conditions.

## Temperature units