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rest mass
rest mass (plural rest mass·es)


noun 
Definition:
 
mass of immobile object: the mass a body has when it is not moving, as opposed to the additional mass it gains as a result of its movement, according to the theory of relativity
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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