The structuredness of water at elevated temperatures along the saturation line

✍ Scribed by Y. Marcus

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 743 KB
• Volume: 79
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/s0167-7322(98)00109-3

✦ Synopsis

The structuredness of water is described quantitatively by several parameters over its existence as a liquid, along the saturation line, 0 to 374 °C. One is the number of intact hydrogen bonds, obtained from the ratio of the differences of the condensation Gibbs flee energies of H20 and EhO, AmAGw *, and their hydrogen bond energies, estimated from spectroscopic data, AOOH. Other measures are the Kirkwood dipole orientation correlation parameter, g, the heat capacity density, corrected for that of the vapor, ICy(1 ) -Cp(ig)]/V, the entropy deficit, AA,w~/R, relative to the vapor and an unstructured liquid, and the excess of the cohesive energy density over the internal pressure, [A~,pI-F -R T]/V -Pi. All these measures point to a gradual decrease of the structuredness of liquid water as the temperature increases, but to an appreciable amount of structure remaining up to the critical point.