rest mass

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.


Origin:
1910–15

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Collins
World English Dictionary
rest mass
 
n
the mass of an object that is at rest relative to an observer. It is the mass used in Newtonian mechanics

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

rest mass n.
The physical mass of a body when it is regarded as being at rest.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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