Reference > The New Dictionary of Cultural Literacy > 19. Physical Sciences and Mathematics
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  The New Dictionary of Cultural Literacy, Third Edition.  2002.
 
heavy water
 
 
Water with a higher average molecular weight than ordinary water. In a molecule of heavy water, the hydrogen atoms are isotopes in which the nuclei each contain a proton and a neutron, and hence are twice as heavy as a normal hydrogen atom.  1
 
 
The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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