Definition of molar refractivity in English:

molar refractivity


  • A quantity calculated from a function of the refractive index of a substance multiplied by its molecular weight and divided by its density, which can be taken as a measure of the volume occupied by a molecule of the substance.

    The function of the refractive index is now usually expressed as n 2 − 1/n 2 + 1, where n is the refractive index, so that the molar refractivity is n 2 − 1/n 2 + 1 × M/d.


1920s; earliest use found in Proceedings of the National Academy of Sciences of the United States of America.