Restenergi
Restenergi, or rest energy, is the energy associated with an object's rest mass in the framework of special relativity. For a particle with rest mass m, the rest energy is defined as E0 = m c^2, where c is the speed of light. In its own rest frame, the particle’s total energy equals this rest energy.
In any other frame, the particle's total energy is E = γ m c^2, with γ = 1 / sqrt(1 − v^2/c^2).
The energy–momentum relationship is E^2 = (pc)^2 + (m c^2)^2, where p is the magnitude of the three-momentum.
Rest energy also encompasses internal or binding energy in composite systems, so the rest mass M of
Historically, rest energy arises from Einstein’s mass–energy equivalence (1905) and underpins nuclear reactions, particle physics, and