| heavy w. |
a compound analogous to water but containing deuterium, the mass two isotope of hydrogen, the formula being D2O or 2H2O. It differs from ordinary water in having a higher freezing point (3.8°C) and boiling point (101.4°C), and in the fact that it is incapable of supporting life. It is the stable isotope used as a moderator in nuclear reactors. Called also deuterium oxide.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| heavy-metal s. |
any of the elements of high atomic weight often used as stains in electron microscopy.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| heavy metals |
Metals that are dense. Examples include mercury, lead, silver, gold and uranium.
출처: www.connyankee.com/html/glossary.html
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| heavy metals |
A group of elements that is present in the environment from natural and anthropogenic sources and can produce toxic effects. This group includes mercury, copper, cadmium, zinc, and arsenic.
출처: www.buzzardsbay.org/glossary.htm
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| heavy water |
Water in which the hydrogen is composed of over 99 percent deuterium atoms. The neutron in the deuterium nucleus allows this type of water to slow, or moderate, neutrons from fissioning uranium, permitting a sustained chain-reaction in reactors using natural uranium as fuel. See CANDU, Deuterium, and Moderator.
출처: infomanage.com/nonproliferation/primer/nwg.html
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