The Asentric Factor

It is used in thermodynamic correlations involving fugacity, compressibility factor, enthalpy, and viral coefficients.

Where

P_{c} is the critical pressure P is the vapor pressure at T_{r} = 0.7 T_{c} is the critical temperature T is the temperature.

P_{c} is the critical pressure

P is the vapor pressure at T_{r} = 0.7

T_{c} is the critical temperature

T is the temperature.

see the critical property table