What is the difference between MeV/c2 and MeV?

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SUMMARY

The discussion clarifies the distinction between MeV/c² and MeV, emphasizing that MeV/c² is a unit of mass while MeV represents energy. Specifically, a proton with a mass of 938 MeV/c² can indeed be converted into 938 MeV of energy upon annihilation with an anti-proton, resulting in a total energy release of 1876 MeV. This relationship is grounded in the principles of mass-energy equivalence as articulated by Einstein's equation E=mc².

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what is the difference between MeV/c2 and MeV?

Lets say that proton has 938 MeV/c2 mass, does it mean that it can be converted into 938 MeV worth of energy?
 
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Well, MeV/c^2 is a unit of mass, and MeV is a unit of energy. The rest energy of a particle can be computed in units of MeV by multiplying it's rest mass in units of MeV/c^2 by c^2. So, yes if the proton's mass is 938 MeV/c^2 and it annihilates with an anti-proton, the proton will release 938 MeV of energy and the anti-proton will release 938 MeV of energy as well.
 

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