With the extended applications of high temperature liquids in industry and the needs of more sophisticated Control of their thermodynamic as well as hydrodynamic conditions, demands of thermophysical properties of high temperature liquids are strong. Present status is briefly reviewed for such thermophysicsl properties as the thermal conductivity, the viscosity and the surface tension of high temperature melts, namely, liquid metals, molten salts and molten semiconductor materials.
The measurements of the thermal properties of an oxide superconducter are not only useful to characterize the sample quality, but important to analyze the mechanism of high-temperature superconductivity. The role of the heat capacity measurement in the research of the oxide superconductors is reviewed. The questions about the low-temperature electronic heat capacity, the fluctuation effect near the critical temperature, the effects of magnetic field and the relation between the heat capacity anomaly and fraction of superconducting component, which have not been answered, are discussed.
The international practical temperature scale of 1968 was replaced by the International Temperature Scale of 1990 on 1st January 1990. This revision is based on the recent results of thermodynamic temperature measurement and is also for purposes of the improvement of reproducibiliy of the temperature standards. The basic parts of the new temperature standards are explained with supplementary information.
In this report, the effective thermal conductivity of leathers are measured by employing the steady state comparison method. The effective thermal conductivity vs. temperature diagrams are shown as the basic results. The conductivity increases linearly with increasing temperature for all specimen selected in this study, but increasing rate is small. The authors propose the empirical equation of the effective thermal conductivity of the leathers by using the results between the effective conductivity and the effective density. This equation is able to estimate the conductivity within about +5%.