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Deuterium oxide -- or "heavy water" -- is composed of water molecules formed by two deuterium atoms and one oxygen atom. Deuterium is a stable isotope of hydrogen containing one proton and one neutron in its nucleus. The more common hydrogen atom contains no neutrons in its nucleus. Heavy water is about 10 percent denser than regular water. Its specific gravity is 1.106. Since regular water weighs 8.34 pounds per gallon, a gallon of heavy water, therefore, weighs 9.22 pounds.

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