✍ Scribed by M. Durieux; H. Van Dijk
No coin nor oath required. For personal study only.
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.
📜 SIMILAR VOLUMES
Enthalpy increments measured with a flow calorimeter are reported for \(\mathrm{CO}_{2}\) at temperatures from \(233.169 \mathrm{~K}\) to \(358.140 \mathrm{~K}\) at pressures near \(15 \mathrm{MPa}\). The reported values agree with literature values within the estimated uncertainties. Results for \(
On the basis of the vapour pressure of 3He--4He mixtures, partly measured directly by S o m m e r s and by W a n s i n k et al. and partly calculated from the osmotic pressure data obtained by W a n s i n k and Taconis, the change of the Gibbs-function of the mixture with concentration has been calc