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atomic mass unit

atomic mass unit or amu,in chemistry and physics, unit defined as exactly 1/12 the mass of an atom of carbon-12, the isotope of carbon with six protons and six neutrons in its nucleus. One amu is equal to approximately 1.66 × 10^-24 grams.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

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atomic mass unit: meaning and definitions - atomic mass unit: Definition and Pronunciation
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atomic weight - atomic weight atomic weight, mean (weighted average) of the masses of all the naturally occurring ...
atomic mass - atomic mass atomic mass, the mass of a single atom, usually expressed in atomic mass units (amu). ...
phosphorus - phosphorus phosphorus [Gr.,=light-bearing], nonmetallic chemical element; symbol P; at. no. 15; at. ...

See more Encyclopedia articles on: Chemistry: General

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