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One Atomic Mass Unit (AMU, or µ) is the mass of 1/12 of the rest mass of an unbound carbon-12 atom. It is about 1.660 538 921×10-27 kg.

1.0079 µ is 1.673 657 178 x 10-27 kg, which is approximately the mass of a proton (1.672 621 777 x 10-27 kg) or a neutron (1.674 927 351 x 10-27 kg). One kilogram is about 6.022 141 290 x 10+26 µ, which is (about) the Avogadro constant, i.e. the number of particles of a matter in one molar mass of that matter.

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13y ago

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