heavy water
heavy water
English Definitions:
heavy water, deuterium oxide (noun)
water containing a substantial proportion of deuterium atoms, used in nuclear reactors
heavy water (Noun)
water containing deuterium instead of normal hydrogen (symbol DO); used as a moderator in nuclear reactors.
Heavy water
Heavy water, formally called deuterium oxide or =2 H 2O or D2O, is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium, rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water. Therefore, some or most of the hydrogen atoms in heavy water contain a neutron, causing each hydrogen atom to be about twice as heavy as a normal hydrogen atom. The increased weight of the hydrogen in the water thus makes it slightly more dense. The colloquial term heavy water is often also used to refer to a highly enriched water mixture that contains mostly deuterium oxide but also contains some ordinary water molecules as well: for instance heavy water used in CANDU reactors is 99.75% enriched by hydrogen atom-fraction, meaning that 99.75% of the hydrogen atoms are of the heavy type. In comparison, in ordinary water, which is the "ordinary water" used for a deuterium standard on Earth, there are only about 156 deuterium atoms per million hydrogen atoms.
Heavy water
Heavy water (deuterium oxide, 2H2O, D2O) is a form of water that contains only 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 normal water. The presence of the heavier hydrogen 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.
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