- #1

- 464

- 8

## Main Question or Discussion Point

When we say 938 MeV/c^2, is the speed of light already factored in? because I have read in some places where if you multiply this by c^2 you get the energy, and that is 938 MeV rather than 938* (2.998e8)^2

so when considering the rest mass of the proton, is the c^2 a variable, or a unit?

so when considering the rest mass of the proton, is the c^2 a variable, or a unit?