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If you look critically, then you can say that mass is the amount of matter contained in a body and weight is the force with which an object is pulled by earth's gravitational force.

But in this case, atomic mass is the mass of an atom (expressed as a dimensionless number = the number of protons + number of neutrons), while atomic weight is a weighted average of a sample of the substance. With different isotopes, it will differ from the Atomic Mass. See related link.

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13y ago

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