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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.
What Is Acid Water? Acid water is water with a potential hydrogen (pH) of less than 7. pH refers to the amount of hydrogen ions mixed in with the water. pH is measured on a scale from 0 to 14, and 7 represents neutral where the water is neither alkaline nor acidic.