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atomic mass unit
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atomic mass unit

Unit of mass that is used to measure the relative mass of atoms and molecules. It is equal to one-twelfth of the mass of a carbon-12 atom, which is approximately the mass of a proton or 1.66 × 10−27 kg. The relative atomic mass of an atom has no units; thus oxygen-16 has an atomic mass of 16 daltons but a relative atomic mass of 16.



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Furthermore, the weights of different elements will not accord exactly with the number of atomic mass units they possess.
The attraction and repulsion of gravity by Thomsen, Dietrick E. / Science News
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