A New Vapor Pressure Equation


1 Chemical & Petroleum Engineering, Sharif University of Technology

2 Chemical & Petroleum Engineering, University of Tehran


The Wagner equation for prediction of vapor pressure has been modified in order to improve it accuracy. On the basis of this modifications, development of a new equation for prediction of vapor pressure is outlined. Examples of the use of the equation for obtaining vapor pressure for a total of 94 pure substance are given. The proposed equation combines simplicity and accuracy and performs as well or better than the other correlations. This equation is tested and its advantages in obtaining vapor pressure are shown.