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: E^2 = m^2 c^4 + p^2 c^2,
where ''c'' is the Speed Of Light , ''E'' is total energy, ''m'' is rest mass, and ''p'' is momentum.

If the momentum is zero (the object is in its inertial rest frame) then the energy-momentum relation simplifies to
: E=mc^2 .
If the object is massless then the energy momentum relation reduces to
: E=pc
as is the case for a Photon .

In Natural Units the energy-momentum relation can be expressed as
: \omega^2 = m^2 + k^2
where ω is Angular Frequency , ''m'' is rest mass and ''k'' is Wave Number .


SEE ALSO