Isosbestic points in liquid water: Further strong evidence for the two-state mixture model

Abstract

Three different types of isosbestic points observed for liquid water are dealt with in this paper—temperature induced Raman, temperature induced structural, and pressure induced structural isosbestic points. These isosbestic points leave no doubt as to the precise two-state outer-neighbor mixture model description of this important substance from supercooled temperatures up to at least 40 °C. New pressure-dependent Raman experiments are suggested that will help confirm further this most simple idea that has already been shown to be quantitatively consistent with the temperature- and pressure-dependent properties of liquid water, including all its anomalies.