Question

Define the atomic mass unit.​

Answer 1

An atomic unit of mass is defined as accurately 1/12 the mass of a carbon-12 atom.

Answer 2

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$carbon - 12 \: isolute \: was \: chosen \: as \: the \: standard \: reference \: for \: measuring \: atomic \: masses. \: one \: atomic \: mass \: is \: a \: mass \: unit \: equal \: to \: axuatly \: one - twelfth \: ( \frac{1}{12th}) \: the \: mass \: of \: one \: atom \: of \: carbon - 12$