Quantum theory of mass
The Nobel Prize for Albert Einstein
Albert Einstein received his Nobel Prize in Physics neither for the theory of relativity nor for E = m * c². A tragedy of history! He received it for the quantification of light, namely its energy. He proved that light does not appear as a continuous spectrum, but as particles, as photons as multiples of an elementary energy.
Quantification of the mass
But if the difference between two energies, i.e. delta (E) = n, then E = n also applies. Accordingly, one can equate E with n in E = m * c² if one wants to analyze the underlying sets. Then n = m * c². If c² is set equal to 1 according to the unit system, then of course m = n. So the mass is also quantized, it always occurs as a multiple of the elemental mass.