## molar refraction, $$R$$

https://doi.org/10.1351/goldbook.M03979
Function of the @R05240@, $$n$$, given by $$R = V_{\text{m}}\ \frac{n^{2}\,-\,1}{n^{2}\,+\,2}$$, where $$V_{\text{m}}$$ is the molar volume.
Source:
Green Book, 2nd ed., p. 33 [Terms] [Book]