Atomic mass unit
Weil, Jonathan F. Senior Staff Editor, "McGraw-Hill Encyclopedia of Science and Technology," McGraw-Hill Education, New York, New York.
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A unit of mass equal to exactly of the mass of an atom of carbon-12 (12C), the predominant isotope of carbon. The unit, also known as the dalton, is often abbreviated amu, and is designated by the symbol u. The relative atomic mass of a chemical element is the average mass of its atoms expressed in atomic mass units. See also: Relative atomic mass
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