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Relative Atomic Mass: the weighted average mass of an atom of an element compared with 1/12 of the mass of an atom of carbon-12.
Relative Isotopic Mass: the mass of an atom of an isotope as compared to 1/12 of the mass of an atom of carbon-12.
Relative Molecular Mass: the weighted average mass of one molecule of an element or compound compared with 1/12 of the mass of an atom of carbon-12.
Relative Formula Mass: the weighted average mass of one unit of a substance compared with 1/12 of the mass of an atom of carbon-12.
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