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The dimensionless value of critical compressibility factor in the van derWaals theory of gas-liquid critical point is a universal constant, $Z_\text{c}= 0.375$. Experimentally measured values of this quantity for simple fluids areconsiderably smaller than the theory prediction. Van der Waals once assumedthat this discrepancy can be removed by taking account of the impact of themolecular pseudo-associations on the fluid criticality but he did not completea proper modification of his theory following up on this idea. Thecommunication is devoted to the filling of this gap.

The van der Waals idea of pseudo associations and the critical compressibility factor