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Fusion happens when an electromagnetic force normally preventing fusion is overcome.

The electromagnetic force exists because the nuclei of atoms are positively charged. They are rather like identical poles of magnets that want to repel each other. Fusion takes place when something overcomes this and pushes them into each other, at which point, the more powerful strong nuclear force can bind them. This can happen because of kinetic energy, which exists when atoms are hot. It can be influenced by such a thing as pressure.

The strong force works at much shorter distance than gravity and magnetism, which is why it can overcome electromagnetism at the close range of nuclei nearly together.

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