heavy water

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heavy water

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

(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

water in which hydrogen atoms have been replaced by deuterium, used as a nuclear reactor coolant.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.

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.

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Noun

heavy water - water containing a substantial proportion of deuterium atoms, used in nuclear reactors

deuterium oxide

moderator - any substance used to slow down neutrons in nuclear reactors

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.

MP: Increase of Iran's Uranium Stockpile above N. Deal Cap Natural Result of US Bans

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.

Shisper Glacier recedes after heavy water discharge; mitigates outburst flooding risk

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.

Iran complying with nuclear deal's key limits: UN nuclear agency

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.

Federal govt doing nothing for Thar: PPP

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.)

Shutdown helps Iran comply with deal

Russia and Iran cooperate on 'Stable Isotopes' and finalizing supply of 39 tons of heavy water to Russia on the international price.

Araqchi and Ryabakov confered about selling heavy water to russia

Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi has prevented shipping Iran's heavy water to the US.

Iran's atomic chief prevents shipping heavy water to 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.

U.S. buys Iranian heavy water as part of nuke deal

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.

US To Purchase Heavy Water From Iran

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.

Oman helps in Iranian heavy water transport

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.