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Atomic Mass Unit Definition (amu)

Chemistry Glossary Definition of Atomic Mass Unit (amu)

By Anne Marie Helmenstine, Ph.D., About.com

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Definition: an atomic mass unit or amu is one twelfth of the mass of an unbound atom of carbon-12. It is a unit of mass used to express atomic masses and molecular masses.

Also Known As: unified atomic mass unit (u), Dalton (Da) or universal mass unit

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