To the understanding of the structural sensitivity of the temperature coefficient of internal pressure

The previously found empirical relationships between the temperature coefficient of internal pressure, on the one hand, and the structure and its evolution in liquids due to variations of temperature and concentration, on the other, are interpreted in terms of the peculiarities of intermolecular interactions. Analysis has revealed that the curves of the temperature dependences of internal pressure P-i(T) of associated liquids are directed upward by their concavity; they have a minimum and asymptotically tend toward P-i = 0 at T ->infinity. The curves P-i(T) of weakly associated liquids are directed downward by their concavity and have no extrema, but asymptotically tend to zero at T ->infinity.