Kelvin

Kelvin (symbol: K) is one of the seven SI base units. It is defined by two factors: zero kelvins is absolute zero (molecular motion stops), and one kelvin is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water (0.01 °C). The Celsius temperature scale is now defined in terms of kelvins.

It is named after the physicist and engineer William Thomson, who became Lord Kelvin when he was made a peer.