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:
Noun1.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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References in periodicals archive ?
There exist steady electromagnetic states in the vacuum for which the energy density of the electromagnetic field gives rise to nonzero rest masses of corresponding particle models.
He believes his two values, 4 and 20 eV, come from a mixture of two kinds of neutrino with two different rest masses being involved.
We make two hypotheses: The rest masses and electric charges of the material particles increase slightly with the passage of time (selfvariations), and the consequences of this increase propagate in four-dimensional spacetime with a vanishing arc length.
The latter is characterized by intrinsic linear symmetry breaking, leading in general to nonzero rest masses of elementary particles.
i], exactly as the law stated in equation (265) determines the interaction of the rest masses [m.
p] and me are the rest masses of proton and electron respectively.
The relativistic dynamical equation of motion for particles of non-zero rest masses in combined electric and gravitational fields is given as [2]
The rest masses of all these particles are measured with high precision.
Such oscillations would become analogous to those of neutrinos which have nonzero rest masses.
Corresponding to every particle or object of rest mass m0 located at a point in our proper Euclidean 3-space [SIGMA]', there are identical symmetry-partner particles or objects of rest masses to be denoted by [m.
The derivations of the flat two-dimensional proper intrinsic spacetime ([phi][rho]', [phi]c[phi]t') containing intrinsic rest masses ([phi][m.
Table 2 presents the considered set of particles, their rest masses and positions on the logarithmic scale.