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Nuclear fission is a nuclear process where an atomic nucleus, usually a heavy one, splits into two or more smaller nuclei along with other particles and the release of a large amount of energy. This process typically involves a neutron bombarding the nucleus which causes the nucleus to become unstable and then break apart. An example of a nucleus that undergoes nuclear fission is uranium-235.

Nuclear fusion is another nuclear process in which two or more atomic nuclei come together to form a single, heavier nucleus. This process results in the release of a considerable amount of energy, usually in the form of light and heat. The most common nuclear fusion reaction takes place between two isotopes of hydrogen: deuterium and tritium, forming helium.

In nuclear fission, a heavy nucleus breaks apart into lighter nuclei, whereas, in nuclear fusion, lighter nuclei combine to form a heavier nucleus. Both processes involve a change in the initial atomic nuclei, but the mechanism through which the change occurs differs significantly.

Both nuclear fission and nuclear fusion release energy, but the energy released in nuclear fusion is considerably higher than that released in nuclear fission. This is because the fusion of light elements like hydrogen has a more significant mass difference between the reactants and the products, resulting in a greater release of energy.

Nuclear fission is the principle behind the working of nuclear power plants, producing electricity by using the energy released during the fission process. This technology is currently in use around the world. Nuclear fusion, on the other hand, holds great potential for clean, sustainable, and abundant energy production. However, achieving controlled nuclear fusion has been a challenge, and the technology is still under development. Fusion also powers the Sun, providing light and warmth to the Earth. To summarize, nuclear fission involves the splitting of heavy nuclei into lighter ones and has practical applications in electricity production. Nuclear fusion, on the other hand, involves the combination of light nuclei to form a heavier nucleus and has the potential for future energy production. The primary difference between the two processes lies in the mechanism and energy release.