molar refraction, \(R\)

https://doi.org/10.1351/goldbook.M03979
Function of the @[email protected], \(n\), 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]