The molar mass constant converts relative atomic mass or relative molecular mass into molar mass. It is approximately . Its SI numerical value is determined experimentally: the exact Avogadro constant multiplies an experimentally determined unified atomic mass unit in kilograms. Treating as exactly is therefore an excellent elementary-calculation approximation, rather than a defining equality of the modern SI.[ref]
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The molar mass constant, often denoted by \( M_{\text{molar}} \) or \( M \), is a fundamental constant that relates the mass of a substance to the amount of substance in moles. It is defined as the mass of one mole of a substance (usually in grams per mole, g/mol). The molar mass of an element is numerically equal to its atomic mass (in atomic mass units, amu), but expressed in grams per mole.