Kelvin Temperature Scale Definition

Definition of Kelvin Temperature Scale

The Kelvin temperature scale does not use degrees or have negative numbers because it is an absolute scale. Degrees are used when referencing another scale!. Malcolm Piers/Getty Images

Kelvin Temperature Scale Definition

The Kelvin temperature scale is an absolute temperature scale based on the definition that the volume of a gas at constant (low) pressure is directly proportional to temperature and that 100 degrees separates the freezing and boiling points of water.


Kelvin temperatures are written with a capital letter 'K' and without the degree symbol, such as 1 K, 1120 K. Note that 0 K is 'absolute zero' and there are no negative Kelvin temperatures.