rest energy


rest energy
noun
the energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light
Hypernyms: ↑energy, ↑free energy

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Physics.
the energy equivalent to the mass of a particle at rest in an inertial frame of reference, equal to the rest mass times the square of the speed of light.
[1935-40]

Useful english dictionary. 2012.