| Themes > Science > Physics > Nuclear Physics > ABC's of Nuclear Science > Reactions > Reactions |
If nuclei come close enough together, they can interact with one another through the strong nuclear force, and reactions between the nuclei can occur. As in chemical reactions, nuclear reactions can either be exothermic (i.e. release energy) or endothermic (i.e. require energy input). Two major classes of nuclear reactions are of importance: fusion and fission. |
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