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Thermodynamic properties of the ST2 model for supercooled liquid waterexhibit anomalies similar to those observed in real water. A possibleexplanation of these anomalies is the existence of a metastable, liquid-liquidtransition terminated by a critical point. This phenomenon, whose possibleexistence in real water is the subject of much current experimental work, hasbeen unambiguously demonstrated for this particular model by most recentsimulations. In this work, we reproduce the anomalies of two versions of theST2 model with an equation of state describing water as a non-ideal "mixture"of two different types of local molecular order. We show that the liquid-liquidtransition in the ST2 water is energy-driven. This is in contrast to anotherpopular model, mW, in which non-ideality in mixing of two alternative localmolecular orders is entropy-driven, and is not sufficiently strong to induce aliquid-liquid transition.

Two-state thermodynamics of the ST2 model for supercooled water