Energy–momentum relation

Relativistic equation relating total energy to mass and momentum

In physics, the energy–momentum relation, or relativistic dispersion relation, is the relativistic equation relating total energy (also called relativistic energy) to mass (also called invariant mass or rest mass) and momentum. It is the extension of mass–energy equivalence for bodies or systems with non-zero momentum. It can be formulated as This equation holds for a body or system, such as one or more particles, with total energy E, mass m, and momentum of magnitude p; the constant c is the speed of light.

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