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atomic mass unit

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atomic mass unit

 
Use atomic mass unit in a Sentence
–noun Physics.
1. Also called dalton. a unit of mass, equal to 1/12 the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles.
2. (formerly) a unit of mass, equal to 1/16 the mass of an oxygen atom having atomic mass 16. Abbreviation: amu, AMU
Origin:
1950–55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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atomic mass unit  
n.   Abbr. amu
A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon 12, which is assigned a mass of 12. Also called dalton.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: atomic mass unit
Function: noun
: a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to 1/12 the massof a single atom of the most abundant carbon isotope 12C called also dalton
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

atomic mass unit n.
Abbr. amu
A unit of mass equal to 1/12 the mass of an atom of carbon 12, which is assigned a mass of 12. Also called dalton.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
atomic mass unit  
A unit of mass equal to 1/12 the mass of an atom of the most common isotope of carbon (carbon 12), which is assigned a mass of 12 and has a value of 1.660 × 10-24 grams. A hydrogen atom has a mass of 1 atomic mass unit since its mass is 1/12 the mass of carbon 12. Also called dalton.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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