How do nuclear fusion reactions start?

Answer 1

When the gravitational force of a proto-star's mass is sufficient to fuse hydrogen nuclei.

Fusion is the process of joining atomic nuclei to form larger atoms, releasing enormous amounts of energy. At the moment, the only ways we can accomplish this are with atomic bombs that use a fission nuclear reaction driver, and on a very small and transient scale, with tritium laser implosion.

The gravitational force of the star's mass acts as the driving force in stars, so the nuclear fusion processes in a star can be said to "start" when the accreting mass becomes dense enough to push small nuclei together.

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Answer 2

Audrey Arnold

Nuclear fusion reactions begin with a massive release of energy when two light atomic nuclei, usually hydrogen isotopes, collide rapidly enough to overcome their electrostatic repulsion and combine to form a heavier nucleus.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.