The abundance of deuterium naturally in compounds such as water, and in interstellar space, is about 1.4 × 10-5 that of ordinary hydrogen. Because deuterium is difficult to manufacture and is quickly destroyed in stellar nuclear reactions, one view is that most of the deuterium found in the universe today was formed in the Big Bang. It is an important fuel for nuclear fusion (as in the hydrogen bomb) and is used in tracer studies. Melting point -254.6°C, boiling point -249.7°C.
Related category• ATOMIC AND NUCLEAR PHYSICS
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