| S. No. | NUCLEAR FISSION | NUCLEAR FUSION |
| 1 | The process of breaking up (splitting) of a heavy nucleus into two smaller nuclei is called 'Nuclear fission' | Nuclear fusion is the combination of two lighter nucleus. |
| 2 | Can be performed at room temperature. | Extremely high temperature and pressure is needed. |
| 3 | Alpha , beta and gamma radiations are emitted. | Alpha rays, positrons, and neutrinos are emitted. |
| 4 | Fission leads to emission of gamma radiation. This triggers the mutation in the human gene and causes genetic transform diseases. | only light and heat energy is emitted. |
