Natural units

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Natural units are units of measurement that arise when a physical constant, such as Planck's constant or the speed of light in a vacuum, is set to a dimensionless value such as one.[1] For example, in natural units, since c is set to unity, mass and energy can be expressed in the same units. Therefore, the masses of subatomic particles are often expressed in in electron volts, which are a unit of energy.

Radians used in geometry are one example of a natural constant, since they are defined so that pi radians make a half-turn (more widely known as 180 degrees).


  1. Natural units