Source: wikibot/molar-refractivity
= Molar refractivity
{wiki=Molar_refractivity}
Molar refractivity is a physical property of a substance that relates to how light interacts with the material at the molecular level. It is defined as the measure of how much the speed of light is reduced within a substance compared to its speed in a vacuum, and it incorporates both the volume and the polarizability of the molecules in that substance.