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Molar refractivity

Molar refractivity is a measure of the volume occupied by an atom or group and is dependent on the temperature, the index of refraction, and the pressure.

One form of the Lorentz-Lorenz formula (also known as the Clausius-Mossotti equation) gives the molar refractivity of a dilute gas as A = \frac{R T (n^2 - 1)}{3p}


R is the universal gas constant
T is the temperature
n is the index of refraction
p is the pressure

In SI units, R has units of J mol-1 K-1, T has units K, n has no units, and p has units of Pa, so the units of A are m3 mol-1. Therefore, the molar refractivity is the volume of the substance (in cubic meters) taken up by each mole of that substance.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Molar_refractivity". A list of authors is available in Wikipedia.
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