Energy-momentum relation

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The energy–momentum relation is an equation relating the total energy with any object's momentum and rest mass

Substitution of the relativistic mass m in the formula E = mc² gives

After squaring you get

and calculating gives

For the momentum applies p = mv such that

The total energy is E = mc² and the rest mass energy is E₀ = m₀c² and therefore you can write

You can write the formula also as

where

    m₀ Rest mass

    c Speed of light

    p Momentum

This relation was first established by British quantum physicist Paul Dirac in 1928.