What is nuclear fusion ? Write the conditions for nuclear fusion to occur.

Explanation

Nuclear fusion : The process of combining lighter nuclei to produce a large nucleus is known as nuclear fusion.
E.g : Hydrogen nuclei `(._(1)H^(1))` are fused together to form heavy Helium `(._(2)He^(4))` along with 25.71 MeV energy released.
Conditions for nuclear fusion :
1. Nuclar dusion occurs at very high temperatures such as `10^(7)` kelvin and very high pressures. These are obtained under the explosion of an atom bomb.
2. Higher density is also desirable so that collisions between light nuclei occur quite frequently.