In physics, nuclear fusion is defined as a process by which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles. The difference between the masses of the reactants and products is revealed as either the release or absorption of energy. Lighter elements, such as hydrogen and helium, are in general more fusible. Fusion reactions are of two basic types:
• Those that preserve the number of protons and neutrons
• Those that involve a conversion between protons and neutrons
Energy is released in a nuclear reaction if the total mass of the resultant particles is less than the mass of the initial reactants. Fusion reactions are the primary energy source of stars and our sun is no different as it is powered by a process called nucleosynthesis where, under the process of nuclear fusion hydrogen nuclei is converted into helium.
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