# 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.

## 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

## 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]
ThesaurusAntonymsRelated WordsSynonymsLegend:
 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 bodymass - the property of a body that causes it to have weight in a gravitational fieldnatural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"
Translations
References in periodicals archive ?
The wave mechanics shows that the momentum 3-vector of an electron of a rest mass [m.
It should be hot and dense enough to produce an immense pulse of neutrinos, amounting to about 10% of the star's rest mass.
In a 1997 paper, Woodward discusses transient rest mass fluctuations in electrical circuit components, comparing them to the change in mass of the "accelerated extended bodies" in the Nordtvelt effect.
Finance might also carry out such actions regarding the rest Mass Media.
At that time a known particle with zero mass was only the Photon, a Boson, with tsh spin but he reduced mass of a fermion or an electron in Dirac's equation and got a pair of particles with zero mass and therefore with no electric charge because if a particle has no rest mass but spin half of tsh then we are forced to assign it, zero electric charge.
According to this formula, one can find the momentum of the particle at certain energy and rest mass of the particle, or determine the rest mass and the type of the particle by its momentum and energy.
Thus, remaining within domains of applicability of classical electrodynamics and assuming that the total EM energy is small in comparison with the rest mass energy, one concludes that a charged particle feels rigidly almost the entire bound EM field energy.
Each object when considered in its own rest frame has definitive rest mass and rest length, which can be considered to be characteristic of the object.
Some bodies, such as light, do not have rest mass, and, therefore, might be said not to have inertia.
Abstruse conditions like rest mass, structure, moment of spin, chemical composition, electrical charge, position relative to other objects--aspects fairly difficult to determine.
perpendicular to]] is the momentum perpendicular to the magnetic field, t is the time, m is the rest mass of the charged particle, [gamma]m is the relativistic mass of the charged particle, and q is the charge of the charged particle.
Furthermore, for M in units of the proton rest mass [m.

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