A REVISED REDUCED COMPRESSIBILITY CHART AND FUGACITY DIAGRAM FOR FLUIDS

Abstract

Some tables containing reduced compressibility factors are not consistent to all thermodynamic properties of fluids. Permanent gases have an inversion point at low pressure and high temperature where the Joule-Thomson coefficient equals to 0 and the compressibility factor reaches a maximum with increasing temperature at constant pressure. A new compressi- bility table has been constructed using recent data given for air, ethylene and ammonia. These gases have different critical compressibility factors and represent therefore all types of fluids. Reduced fugacity charts have also been calculated from these data. Diagrams of gases with low critical compressibility factor show quantitative differences.