Journal of Theoretical & Computational Science
Open Access

Abstract

Anomalous Thermodynamic Properties of Water and Water Molecules

Makoto Yasutomi*

For water at atmospheric pressure, in the temperature range from 0°C to 100°C, the specific heat at a constant pressure shows a constant value of approximately 4.2 J/(gK), the density reaches its maximum at 3.98°C and the isothermal compressibility reaches its minimum at approximately 46°C. However, the mechanisms underlying these anomalous thermodynamic phenomena in water remain unclear. However, the thermodynamic mechanism that causes negative thermal expansion of water has recently been elucidated by the present author in relation to the functional shape of the interactions between water molecules. In this study, we further elucidate the mechanisms underlying the changes in the specific heat at constant pressure and isothermal compressibility with temperature by relating these changes to the functional shapes of intermolecular interactions. We also showed that the anomalous thermal behavior of water is produced by the anomalous thermodynamic properties of the interactions between water molecules. The same can be inferred for the ice. The experimental verification of these issues is strongly desired.

Published Date: 2024-06-25; Received Date: 2024-05-24