Nuclear Fusion:Nuclear fusion is a nuclear reaction in which two or more atomic nuclei combine to form a larger nucleus, releasing an enormous amount of energy in the process.
Chain Reaction: In the context of nuclear reactions, chain reaction refers to a self-sustaining series of reactions where each reaction triggers subsequent reactions. It can lead to an exponential increase in the number of reactions and release large amounts of energy.
Critical Mass: Critical mass represents the minimum amount of fissile material required for self-sustained nuclear fission. If there is less than this critical mass present, sustained fission cannot occur.