I seem to have forgotten where I have seen these particular rules; I need them for my research. I think I saw them in a book somewhere... but that was around 4 years ago. Does anyone know where can I find the rules stipulated by statistical mechanics/thermodynamics on the alpha function α(TR) of the cubic equations of state? As far as I remember, there were three rules: α(TR) = 1 when TR = 1 α(TR) approaches 0 when TR approaches infinity α(TR) approaches infinity (???) when TR approaches 0 Please do correct me if I am incorrect; and kindly point me to such resource if you guys happen to know. Thanks!