Abstract
In this study, a generalized equation is presented to calculate vapor pressure of pure substances as a function of reduced temperature, critical pressure, and acentric factor. With the presented model, vapor pressures have been calculated and evaluated with NIST data bank for 70 pure substances for about 14000 data points, and the overall average absolute percentage deviation has been only 0.783%. Also the accuracy of obtained model has been evaluated with mostly used equations and the results indicate the superiority of the proposed model against other methods used in this work.
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