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heavy water
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heavy water

Water containing the isotope deuterium instead of hydrogen (relative molecular mass 20 as opposed to 18 for ordinary water).

Its chemical properties are identical with those of ordinary water, but its physical properties differ slightly. It occurs in ordinary water in the ratio of about one part by mass of deuterium to 5,000 parts by mass of hydrogen, and can be concentrated by electrolysis, the ordinary water being more readily decomposed by this means than the heavy water. It has been used in the nuclear industry because it can slow down fast neutrons, thereby controlling the chain reaction.



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? Mentioned in ? References in periodicals archive
 
In their experiments, Pons and Fleischmann pass an electrical current between palladium and platinum electrodes immersed in a flask containing lithium ions dissolved in deuterium oxide -- a heavy version of water made of oxygen and the hydrogen isotope deuterium.
Big chill for cold fusion as energy source by Amato, I. / Science News
Deuterium oxide is thus two atomic mass units heavier than hydrogen oxide.
Heavy water for very light particles by Science News
Moreover, where deuterium oxide dilution requires drawing blood and underwater weighing requires immersion in a calibrated pool, the infrared technique can be completed in three minutes and may ultimately require no more than the rolling up of one's sleeve.
How fat are you? by Raloff, Janet / Science News
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