Natural units
Stoney units

The Stoney unit system uses the following defining constants:

where c is the speed of light, G is the gravitational constant, k is the Coulomb constant, and e is the elementary charge.

George Johnstone Stoney 's unit system preceded that of Planck by 30 years. He presented the idea in a lecture entitled "On the Physical Units of Nature" delivered to the British Association in 1874. Stoney units did not consider the Planck constant, which was discovered only after Stoney's proposal.
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