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water in which hydrogen atoms have been replaced by deuterium, used as a nuclear reactor coolant.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 final steps have been taken to sell 40 tons of heavy water produced by Iran to Russia and its contract will be signed soon," Salehi said on Saturday.
They report measuring a net energy gain in heavy water but no excess heat using regular water.
In relevant remarks in May, Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi said that "we are in talks with the Russians to sell 40 tons of heavy water to them".
In relevant remarks late May, AEOI Chief Ali Akbar Salehi said that China, the US and Iran have formed a workgroup to modernize Arak heavy water reactor, he said, "We hope to launch the modern Arak reactor in the next five years based on schedule- and of course we are ahead of it.
If the US prevents other countries from purchasing Iran's heavy water or imposes fresh sanctions in this regard, that will definitely constitute a violation of the Joint comprehensive Plan of Action (JCPOA)," Head of Iranian Parliament's Nuclear Committee Mojtaba Zonnour said on Monday.
The United Nations nuclear agency says Iran has taken its heavy water production plant near Arak offline for maintenance, a move that keeps it from violating the controversial nuclear agreement by keeping the amount of the reactor coolant under the limits proscribed by the deal.
To his second point, a sentence in the caption on the article's opening pages, written by the editors of America in WWII--"Nazi scientists manufactured heavy water, the final critical ingredient needed to produce what they hoped would be the world's first atomic bomb"--could be misconstrued to read that heavy water was an element of the bomb.
Russia and Iran cooperate on 'Stable Isotopes' and finalizing supply of 39 tons of heavy water to Russia on the international price.
6 million deal to buy 32 tons of heavy water from Iran.
Summary: The United States is buying 32 metric tons of Iranian heavy water, a key component for one kind of nuclear reactor, to help Iran meet the terms of last year's landmark nuclear deal under which it agreed to curb its atomic program in exchange for billions of dollars in sanctions relief.
will purchase 32 tons of heavy water from Iran, in a deal valued at $8.
Muscat: As per the Royal Orders of His Majesty Sultan Qaboos bin Said, which come in response to a request by the Iranian and US governments to help in transporting a consignment of heavy water (D2O) outside Iran to ensure the validity of the nuclear pact signed between the Islamic Republic of Iran and 5+1 Group, the relevant authorities in the Sultanate made arrangements to shift the consignment out of Iran.