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rest mass
noun
, Physics.
- the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body.
rest mass
noun
- the mass of an object that is at rest relative to an observer. It is the mass used in Newtonian mechanics
rest mass
- In Special and General Relativity, the observed mass of a body that is not in motion with respect to the observer.
- Also called invariant mass
- Compare relativistic mass
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Word History and Origins
Origin of rest mass1
First recorded in 1910–15
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Example Sentences
It would have produced ten thousand million times as much energy as the total disintegration of the rest mass would have produced!
From Project Gutenberg
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