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- DictionaryHeav·y wa·ter/ˈhɛvi ˈwɔdər/
noun
- 1. water in which the hydrogen in the molecules is partly or wholly replaced by the isotope deuterium, used especially as a moderator in nuclear reactors.
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- Heavy water
Chemical compound with two deuterium atoms and one oxygen atom
Heavy water is a form of water whose hydrogen atoms are all deuterium rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water. The presence of the heavier isotope gives the water different nuclear properties, and the increase in mass gives it slightly different physical and chemical properties when compared to normal water. Wikipedia
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