The Sound Velocity in Supercooled and Superheated Water under Atmospheric Pressure.
Progress rept. Nov 75-Nov 77,
YALE UNIV NEW HAVEN CONN DEPT OF ENGINEERING AND APPLIED SCIENCE
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The first chapter of this report contains the description of an experiment aiming to determine the sound velocity in metastable liquids under atmospheric pressure. Results gathered in supercooled and superheated water are reported. Data have been obtained down to -16.75 C in supercooled water, and up to 176.5 C in superheated water. Some evidence for an inflection point in the sound speed versus temperature curve has been obtained at about -10 C. This evidence is partial confirmed by the computation of the thermodynamic sound velocity with the use of available experimental data for supercooled water. In the second chapter some theoretical speculations concerning the anomalous phenomena in supercooled water are proposed. An ad-hoc two-state model is used to simulate the temperature dependences of the isobaric heat capacity and the density. A reasonable agreement between calculated and experimental results has been obtained with the help of one adjustable parameter. The sound velocity has also been calculated through this two-state model and data for the isothermal compressibility. The resulting temperature dependence of the sound speed displays a minimum at around -28 C. Author
- Inorganic Chemistry