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Fusion means mixing and fission means spliting

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Fusion is a process by which two light nuclei join together (fuse) to form a heavier nucleus, and in doing so release considerable energy. Fusion is the process that powers the sun and the stars. It is the reaction in which two atoms of hydrogen combine together, or fuse, to form an atom of helium. In the process some of the mass of the hydrogen is converted into energy.

When 1KG of Solid changes into Liquid at atmospheric pressure is called Latent heat of fusion
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