Question: is mev a unit of mass?
Answer: It is an energy unit used in High-energy physics. A MeV is the Mega electron-volt, e.g. million times more than eV. ... According to Einstein's formula E=mc^2, energy is equivalent to mass (and vice versa), up to the c^2 constant. In SI units, mass is in kilograms , and the speed of light is 3*10^8 m/s.