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A new basic form for vapor pressure equations
Author(s) -
Hall Raymond C.
Publication year - 1964
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.5450420404
Subject(s) - vaporization , vapor pressure , latent heat , thermodynamics , simple (philosophy) , constant (computer programming) , volume (thermodynamics) , function (biology) , mathematics , materials science , mechanics , physics , computer science , philosophy , epistemology , evolutionary biology , biology , programming language
Abstract A general model for the saturated vapor‐pressure‐temperature relationship is presented. The development of this model centered on the discovery that, on the basis of a constant latent heat, the volume change in vaporization can be described with a simple function of pressure. This relationship substitutes into the Clapeyron equation to give an integrateable form. The resulting model is simple, thus it is readily adaptable to computer use, and tends to be inherently reliable as the critical is approached. Constants evaluated for water gave an equation which predicts pressure with 0.2 mean percent error and limited range equations with 0.04 or less.