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It is numerically equal to the relative atomic mass (or atomic weight) in grams.
en.wikipedia.org He continued work on that new element, isolated it, studied its properties, and in 1873 determined its atomic weight.
en.wikipedia.org It could be added that atomic weight is often not truly atomic either, as it does not correspond to the property of any individual atom.
en.wikipedia.org Hydrogen-1, the lightest isotope of hydrogen and the atom with the lowest mass, has an atomic weight of 1.007825 u.
en.wikipedia.org This procedure enabled chemists to determine the new element's atomic weight.
en.wikipedia.org