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rest energy

noun

, Physics.
  1. 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.


rest energy

/ rĕst /

  1. In Special Relativity, the energy corresponding to the rest mass of a body, equal to the rest mass multiplied by the speed of light squared.


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Word History and Origins

Origin of rest energy1

First recorded in 1935–40

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