measures temperature using the Celsius scale and thermodynamic temperature using the kelvin scale, which is just the Celsius scale shifted downwards so that 0 K= −273.15°C, or absolute zero.

In this interactive, create your own temperature scale by choosing fixed points of your own. Then see how your scale compares with the Fahrenheit, Celsius, and Kelvin scales.—Richard Pommier ...

The color temperature of light denotes how the light appears on a spectrum from warm (yellow-toned) to cool (blue-toned). It's measured in degrees of Kelvin (K) on a scale from 1,000 to 10,000.