Refractive index: period 4
The refractive index is quoted for the gas or vapour state at 273 K/760 mm Hg for the sodium yellow d-line at 589.3 nm.
Air has a refractive index of 1.000292 under these conditions.
Water vapour has a refractive index of 1.000256 under these conditions.
- G.V. Samsonov (Ed.) in Handbook of the physicochemical properties of the elements, IFI-Plenum, New York, USA, 1968.
- A.M. James and M.P. Lord in Macmillan's Chemical and Physical Data, Macmillan, London, UK, 1992.
- G.W.C. Kaye and T.H. Laby in Tables of physical and chemical constants, Longman, London, UK, 15th edition, 1993.