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It is shown that the ratio of the Boyle temperature to the product ofcritical temperature and critical compressibility factor is equal to the number9 with high accuracy for 21 real substances as predicted from Van-der-Waalsequation of state. The relation is suggested to find the critical volume viathe ratio of the Boyle temperature to the critical pressure. The formula issuggested also to define the critical volume via the critical temperature andthe parameters of the linear line of unite compressibility.

The relation of the parameters of the critical point of liquid-gas transition with the Boyle temperature