heavy water


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heavy water

n.
Either of two isotopic forms of water, especially deuterium oxide, consisting chiefly of molecules that contain deuterium instead of protium. Heavy water is used as a moderator in certain nuclear reactors.

heavy water

n
(Elements & Compounds) water that has been electrolytically decomposed to enrich it in the deuterium isotope in the form HDO or D2O

heav′y wa′ter


n.
water in which hydrogen atoms have been replaced by deuterium, used as a nuclear reactor coolant.
[1930–35]

heavy water

Water formed of oxygen and deuterium. Heavy water is much like ordinary water but has higher freezing and boiling points. It is used in certain nuclear reactors for cooling.
Did You Know? How can one drop of water be heavier than another? The answer lies at the atomic level. Normal hydrogen has a nucleus consisting entirely of one proton, around which whirls one electron. However, in a variety of hydrogen called heavy hydrogen or deuterium, a neutron accompanies the proton in the nucleus. Deuterium thus weighs about twice as much as standard hydrogen. The substance we call heavy water is H2O in which many of the hydrogen atoms are replaced by deuterium. Heavy water played a part in the development of the atomic bomb during World War II. It is an excellent absorber of the neutrons that are produced in large quantities in a nuclear chain reaction. It therefore provided a means of regulating the reactions so that they could be studied safely. Once it was shown that a controlled chain reaction was possible, making a device that could create a powerful uncontrolled chain reaction—an atomic bomb—seemed within reach. Heavy water is still found today in nuclear power plants that use natural uranium fuel.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.heavy water - water containing a substantial proportion of deuterium atoms, used in nuclear reactors
moderator - any substance used to slow down neutrons in nuclear reactors
Translations
eau lourde
tungtvann
References in periodicals archive ?
The proposed deal also commits Iran to a pledge not to reprocess plutonium - which it would be able to do in several years' time, once it completes work on a heavy water reactor in the city of Arak.
These nuclei stick closer to the oxygen nuclei within the heavy water molecule, and an oxygen atom from a nearby heavy water molecule exerts a weaker pull.
The paper quoted its sources, as saying that one of the channels used to carry heavy water for cooling had to be opened for checking, as the temperature was increasing because of less flow of water in it.
In relevant remarks in August, Chinese nuclear officials in a meeting with Salehi promised to help Tehran modernize its heavy water reactor in the Central city of Arak.
Heavy water is used as a moderator for efficient use of fuel, but it costs 50,000 yen per liter.
Why were the Norwegian heavy water manufacturing plants an important Allied target during the Second World War?
A seven-hour emergency was imposed at KANUPP following leakage of heavy water from a feeder pipe of the reactor on Tuesday night.
When Klaus Hansen swallowed heavy water in 1935, he joined a fellowship of researchers who have conducted (and continue to conduct) self-experiments in the name of science.
In relevant remarks, Spokesman of the Atomic Energy Organization of Iran (AEOI) Behrouz Kamalvandi announced earlier this month that four members of the G5+1 are due to cooperate with Tehran in redesigning its heavy water reactor in Arak.
n The heavy water plant was later destroyed by Norwegian resistance fighters in an operation organised by Britain's Special Operations Executive.
Kaiga has four units of pressurised heavy water reactors, each having a capacity of 220 megawatt.
Heavy water contains a heavier hydrogen particle that allows a nuclear reactor to run on the natural uranium mined by Iran, without undergoing the enrichment process.