Here the energies involved are in the range of
electron volts On the other hand,  in a nuclear reaction, the energy release
is of the order of MeV Thus for the same quantity of matter, nuclear
sources produce a million times more energy than a chemical source Fission of 1 kg of uranium, for example, generates 1014 J of energy;
compare it with burning of 1 kg of coal that gives 107 J