The absolute turbidities of some pure liquids

Turbidities and Rayleigh ratios have been measured at 25°C. and at wave lengths of 4358 and 5461 A. for benzene, carbon tetrachloride, toluene, and methyl ethyl ketone. The results obtained are in agreement with the theoretical Einstein equation for the scattering of light by pure liquids, the data yielding for Avogadro's number a value of 5.98 × 10 23 ± 4.7%, as against the accepted value of 6.02 × 10 23 . Further, the Rayleigh ratios are in accord with the published measurements of Doty, Zimm, Brice, and their co‐workers, but not with the older literature or the values of Stamm and Button.