: the refractivity of a medium divided by its density.

What is specific and molar refractivity?

Specific Refraction. ... Molar refractivity, , is a measure of the total polarizability of a mole of a substance and is dependent on the temperature, the index of refraction, and the pressure.

What Refractivity means?

Medical Definition of refractivity

: the ability of a substance to refract light expressed quantitatively specifically : the index of refraction minus one.