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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

heavy water

n
(Elements & Compounds) water that has been electrolytically decomposed to enrich it in the deuterium isotope in the form HDO or D2O
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

heav′y wa′ter


n.
water in which hydrogen atoms have been replaced by deuterium, used as a nuclear reactor coolant.
[1930–35]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
eau lourde
tungtvann
References in periodicals archive ?
"The US has also banned the export of Iran's heavy water, which has also caused an increase in our heavy water reserves," he added.
The GBDMA official mentioned that aerial visit of the glacial lake behind the Glacier had further clarified the situation and revealed that the heavy water discharge from June 22 to June 23 in Hassanabad Nullah (watercourse) helped mitigate the risk and brought the accumulated glacial lake water down to negligible ratio.
According to the report, the IAEA verified on May 26 that following a halt in the production of heavy water at the Heavy Water Production Plant (HWPP) between April 15, 2019 and May 22, 2019, operation of the plant had resumed and that Iran's stock of heavy water was 125.2 metric tonnes, an increase of 0.4 tonnes on February but still under the 130-tonne limit.
If there is more water downstream Kotri then Thar will also get water and there will be less heavy water but some people who have no realisation that certain amount of water has to fall in the sea make hue and cry that water is being wasted in the sea,' she said.
At the time of the report, Tehran's heavy water stockpile was at 128.2 metric tons, just under the limit of 130 metric tons (over 143 avoirdupois tons.)
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.
Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi has prevented shipping Iran's heavy water to the US.
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 $8.6 million, the Wall Street Journal reported Friday, citing senior American officials.
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.
governments to help in transporting a consignment of heavy water (D2O) outside Iranto ensure timely validity of the nuclear pact, which was signed between the Islamic Republic of Iran and 5+1 Group, the relevant authorities in the Sultanate, after maintaining coordination with the U.S.