Review of Mass in Special Relativity
In special relativity, the invariant mass (hereafter simply "mass") of an isolated system, can be defined in terms of the energy and momentum of the system by the relativistic energy-momentum equation:
Where E is the total energy of the system, p is the total momentum of the system and c is the speed of light. Concisely, in fundamental units where, the mass of a system in special relativity is the norm of its energy-momentum four vector; otherwise, it is .
Read more about this topic: Mass In General Relativity
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