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The empirical formula of Timmermanns connecting the density of the crystal atzero absolute temperature with the parameters of the critical point of thegas-liquid phase transition is derived theoretically from the Van der Waalsequation of state using the conditions of phase equilibrium. Two equations ofstate with three parameters describing the critical point of any pure substanceare considered. The formula is derived approximately from the first equationand exactly from the second one.

Correlation of the critical parameters of the gas-liquid phase transition and the density of the crystal at zero absolute temperature