Skip to main content

# Formula Relativistic energy-momentum relation

## Energy

Unit
Relativistic total energy of a body, which is also valid at high velocities.

## Rest energy

Unit
Rest energy is the energy of the body in its resting frame of reference. The rest energy of a photon is zero.

## Momentum

Unit
Relativistic momentum of the body.

## Speed of light

Unit
Speed of light is a physical constant with the value (in vacuum): $$c = 299 \, 792 \, 458 \, \frac{\mathrm{m}}{\mathrm{s}}$$.