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Adaptation of van der waals equation of state to the gaseous and liquid behavior of argon: Its application to simple substances
Author(s) -
Daniil A.,
Thodos George
Publication year - 1972
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450500311
Subject(s) - van der waals force , argon , equation of state , van der waals equation , thermodynamics , chemistry , theorem of corresponding states , van der waals radius , volume (thermodynamics) , physics , molecule , organic chemistry
Utilizing the fact that the co‐volume parameter, b = v c /3, van der Waals equation of state has been reduced to the form\documentclass{article}\pagestyle{empty}\begin{document}$$\left( [P_R + \frac[\beta ][[v_R^2 ]]] \right)\left( [v_R - \frac[1][3]] \right) = \frac[[T_R ]][[Z_c ]]$$\end{document}where β = a/P c v 2 c and z = P c v c /RT c . PVT data for argon, extending into the liquid region, have been utilized to establish the cohesive pressure parameter a as a function of temperature and density. This dependence is expressed in equation form and has been used to predict the PVT behavior of argon in its gaseous and liquid states, with an average deviation of 1.35% (250 points). The deviations resulting from this relationship for substances having similar z c ‐values (z c ≈ 0.291) were found to be of this order of magnitude.