Abstract
Most of the three parameter corresponding-states equations proposed for estimating vapor pressures use the critical temperature Tc, the critical pressure Pc and Pitzer’s acentric factor ω as input parameters. These equations must be self-consistent, i.e. they must reproduce the value of ω used as an input. In this work, we have checked this consistency for nine well-known vapor-pressure equations and we have found that it is satisfied with high accuracy for most of them, but not for all. On the basis of this consistency, we propose some conditions that can help to reduce the number of fitting coefficients in this type of vapor-pressure equations.
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