THERMODYNAMIC AND ELECTRIC TRANSPORT PROPERTIES OF FLUID CESIUM AND RUBIDIUM IN THE M-NM TRANSITION REGION

Abstract
The paper reports new experimental results of the electrical conductivity, σ, and the PVT-data of fluid cesium and rubidium which have been measured simultaneously at sub- and supercritical conditions. In the presentation of these data special emphasis is given to the observed corresponding state behaviour. In the M-NM transition region, i.e. in the density range ρ_c < ρ < 2 ρ_c-<_c being the critical density - a striking similarity is found in the conductivity change between cesium and rubidium. Next to the critical point, defined by the steep divergence of the thermodynamic derivatives obtained from the PVT-data, such as compressibility and thermal expansivity, the observed conductivity for both cesium and rubidium is 250 ± 150 Ω^-1cm^-1.