rest mass
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rest mass
n.
The physical mass of a body as measured by an observer who perceives the body as motionless. Rest mass is an inherent property of elementary particles. Also called invariant mass.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
rest mass
n
(General Physics) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
rest′ mass`
n.
the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body in the theory of relativity.
[1910–15]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Noun | 1. | rest mass - (physics) the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body mass - the property of a body that causes it to have weight in a gravitational field natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics" |
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