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deuterium
deuterium An isotope of hydrogen, the nucleus of which is composed of one proton and one neutron. Deuterium is expected to have been produced in the Big Bang as a by-product of the nuclear reactions that produce helium. This makes it potentially important as a test of the Big Bang model, because deuterium cannot easily be made in stars, and any significant quantity of deuterium observed today is therefore presumably of primordial origin.
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"deuterium." A Dictionary of Astronomy. 1997. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "deuterium." A Dictionary of Astronomy. 1997. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O80-deuterium.html "deuterium." A Dictionary of Astronomy. 1997. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-deuterium.html |
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deuterium
deuterium , isotope of hydrogen with mass no. 2. The deuterium nucleus, called a deuteron, contains one proton and one neutron. Deuterium is also called heavy hydrogen, and water in which the hydrogen atoms are deuterium is called heavy water (deuterium oxide, D 2 O). Deuterons are sometimes used in particle accelerators, and heavy water is used in "swimming pool" nuclear reactors as a moderator. |
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"deuterium." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "deuterium." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1E1-deuteriu.html "deuterium." The Columbia Encyclopedia, 6th ed.. 2008. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-deuteriu.html |
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deuterium
deuterium Isotope (D or H2) of hydrogen whose nuclei contain a neutron in addition to a proton. Deuterium occurs in water as D2O (heavy water), from which it is obtained by electrolysis. Heavy water is used in some nuclear reactors as a moderator that slows down free neutrons to increase nuclear fission. Properties: r.a.m. 2.0144.
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"deuterium." World Encyclopedia. 2005. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "deuterium." World Encyclopedia. 2005. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O142-deuterium.html "deuterium." World Encyclopedia. 2005. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-deuterium.html |
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deuterium
deu·te·ri·um / d(y)oōˈti(ə)rēəm/ • n. Chem. a stable isotope of hydrogen with a mass approximately twice that of the usual isotope. (Symbol: D) |
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"deuterium." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "deuterium." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O999-deuterium.html "deuterium." The Oxford Pocket Dictionary of Current English. 2009. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-deuterium.html |
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deuterium
deuterium (chem.) an isotope of hydrogen. symbol D. XX. f. Gr. deúteros (cf. next) + -IUM.
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T. F. HOAD. "deuterium." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. T. F. HOAD. "deuterium." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O27-deuterium.html T. F. HOAD. "deuterium." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-deuterium.html |
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