PROPERTIES OF LIQUID WATER .4. THE ISOTHERMAL COMPRESSIBILITY MINIMUMNEAR 50-DEGREES-C

Arguments presented in the first three papers of this series (1, J. Ph ys. Chem. 1987, 91, 5818; 2, 1994, 98, 2222; 3, 1994, 98, 8591) suppor ting a ''mixture model'' of liquid water are extended to describe pres sure effects. In the present paper, a quantitative assessment is given in terms of mixture model parameters of the temperature dependence of the isothermal compressibility of liquid water at atmospheric pressur e. The ''anomalous'' minimum in this quantity near 50 degrees C is sho wn to emerge naturally.