What occurs to the mass difference when four hydrogen nuclei are fused into one helium nucleus?

Answer

It is converted directly into energy

The mass of the resulting helium nucleus is slightly less than the combined mass of the initial four hydrogen nuclei; this lost mass is released as energy, consistent with Einstein's mass-energy equivalence relationship.

What occurs to the mass difference when four hydrogen nuclei are fused into one helium nucleus?
hydrogenimportancestarFusion