Corresponding states for polyatomic molecules

An important approach to the problem of pol3tatomic molecules has been made by Trappeniers [1951, 1952] who formulated a theorem of corresponding states for polyatomic molecules of globular t3rpe. The assumptions used are similar to those considered in Ch. II, 4. Moreover it is assumed that ... 

A different approach to the problem has been given by Pitzer [1955] and Pitzer, Lippmann, Curl, Huggins and Petersen [1955]. These authors also give a theorem of corresponding states for polyatomic molecules, containing three parameters. These parameters however have no simple molecular meaning (such as e, r and but are empirical. They choose the critical temperatute, the critical pressure and the vapour pressure at a specified reduced temperature. Formally... 

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