Abstract

The density of sodium-saturated vapor has been measured in the range 100°C–180°C. The density values were obtained by measuring the absorption coefficient of the DI line by magnetic scanning. The absorption line was scanned by placing a spectral lamp in a variable magnetic field and by filtering out one of the components of the emitted D1 line. The experimental points have been fitted with the equation logp = AB/T + C logT. Together with our measurements we considered as well all of the other available data below 300°C. The best values of A, B, and C were found to be A = −55.182 40; B = 1081.2523; C = 20.029 33.

© 1971 Optical Society of America

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