Define the atomic mass unit.
(N/A) One atomic mass unit $(amu)$ is a mass unit equal to exactly one-twelfth $(1/12^{th})$ the mass of one atom of carbon-$12$.
The relative atomic masses of all the elements have been determined with respect to an atom of carbon-$12$.
The relative atomic masses of all the elements have been determined with respect to an atom of carbon-$12$.
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