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Heavy water (deuterium oxide (2H 2O) or D 2O) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
Water vs Heavy Water. Water is the lifeline of all living organisms. About 70 per cent of the Earthâs surface is covered with water. Heavy water is also water, but it contains a higher proportion of the hydrogen isotope â deuterium. Two hydrogen atoms and one oxygen atom makes a water molecule.