DENSITY DIFFERENCES AT THE CRITICAL POINT ACCORDING TO R. PLANK'S EQUATION OF STATE

1 May 1938

journal article
Published by Canadian Science Publishing in Canadian Journal of Research

Vol. 16a (5) , 89-99
https://doi.org/10.1139/cjr38a-010

Abstract

If R. Plank's equation of state is assumed to apply, the densities measured at two levels, 1 cm. apart, in a column of gas kept at the critical temperature, may differ by more than 5%. A large correction is therefore required for densities determined at the critical point unless the entire contents of the tube is vigorously stirred. Van der Waal's equation shows that the difference in level corresponding to a relative difference in density, (ρ – ρ_c)/ρ_c, is proportional to the third power of the relative difference; according to Wohl's equation it is proportional to the fourth, and according to Plank, to the fifth, power of the relative difference in density.

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