EFFECT OF HYDROGEN-BONDS ON THE THERMODYNAMIC BEHAVIOR OF LIQUID WATER

We propose an extension of the van der Waals equation which is designe d to incorporate, in an approximate fashion, the effects of the networ k of hydrogen bonds that exist in liquid water. The resulting model qu alitatively predicts the unique thermodynamic properties of water, inc luding those of the deeply supercooled states. It also reconciles two proposals for the phase behavior of supercooled and stretched water an d provides a thermodynamic origin for the observed polymorphism of the amorphous solid form of water.