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→About Unified Atomic Mass Units
===About Unified Atomic Mass Units===
*Used to express atomic and [[Molecule|molecular]] masses.
*1 u = 1.660539040 x 10^<sup>-27 </sup> [[Kilogram|kg]].
*Provides a convenient scale for comparing the masses of atoms.
*'''Unified atomic mass units''' may be denoted with a lower case 'u' or with an upper case 'D', followed by a lower case 'a'.