The effective diameters of molecules sgr;cpof some molecular liquids, i.e., liquids halogens, carbon tetrachloride and benzene, have been estimated by a critical packing fraction of eegr;cp= 0.130thinsp;44 predicted for a van der Waals fluid. It turns out that the estimated values of sgr;cpare in good agreement with the effective diameters sgr;sfestimated independently to explain the structure factor of the liquids. It seems that both the liquid structure and the critical point are determined by a common factor, i. e., a common effective diameter of molecules, and that the simple relation of eegr;cpbartil;0.13 holds fairly well even in the molecular liquids.
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