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Selected category: mass.
Selected initial unit : atomic mass unit (amu).
Definition and details for atomic mass unit (amu):
Atomic mass unit (u or amu) is a unit of mass used by chemists and physicists for measuring masses of atoms and molecules. In 1960 it was defined as 1/12 of the mass of the carbon-12 atom. This unit is approximately 1.66x10-27 kg.
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