23. Heat flush and mobility of ions in helium II

✍ Scribed by G. Careri; F. Scaramuzzi; J.O. Thomson

• Book ID: 104162814
• Publisher: Elsevier Science
• Year: 1958
• Weight: 68 KB
• Volume: 24
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(58)80538-8

✦ Synopsis

Earlier measurements 1) of the dielectric constant of liquid helium under its saturated vapor pressure gave detailed values of the density and thermal expansion coefficient. These measurements have now been extended to pressures of one atmosphere thus permitting the determination of the isothermal compressibility and the slope of the ~-line as well as the thermal expansion coefficient as a function of pressure. Preliminary isothermal compressibility (K~,) data are consistent with the accepted values of the adiabatic compressibility and ~ and suggest a discontinuity in/~ of aboqt 3 per cent at the ~-point. The measurements of (dp/dT)~ and thermal expansion coefficient under pressure, which are also in progress, should permit a direct comparison with the Ehrenfest relation (dp/dT)~ ~ ~=/~/~T. Dielectric constant measurements should also prove useful in the determination of vapor densities.