Nuclear Fission and Fusion both are reactions taking place at nuclear level in atoms.
| Nuclear Fission | Nuclear Fusion |
|---|---|
| In this process , a heavy nucleus is when striked by neutrons, it breaks into two or more light nuclei and liberates a huge amount of energy | In this process , two or more light nuclei fuse together to form a heavy nucleus and liberates a huge amount of energy. |
| Energy released is about 200MeV. | Energy released is about 26.7MeV . |
| Neutrons are emitted in this process. | Protons are emitted in this process. |
| A chain reaction is initiated in this process. | It does not give rise to chain reaction. |
| It takes place spontaneously at ordinary temperatures. | It takes place at very high temperatures about 10° C. |
| It can be performed at controlled conditions . | It cannot be performed under controlled conditions. |
| Radioactive substances are emitted in this process like alpha , beta , gamma . | It doesn't emit any kind of radioactive radiation. |