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Why is nuclear fusion difficult to start?

Nuclear fusion is the process of combination of lighter nuclei (eg. hydrogen)  to form a heavier nucleus. When two lighter nuclei come close to each other, there is strong electrostatic force of repulsion between the nuclei. So this process is difficult.

To carry out this process high temperature (=10000000 K ) and pressure is required. Hence it is also called thermo-nuclear reaction.
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