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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.
Rating Newest Oldest. Best Answer: All water has the same percent amount of deuterium (the isotope of hydrogen found in heavy water) unless it has been processed to remove it from one volume of water and increased in another, or removed.