Correlations of attainable superheat of fluid alkali metals

The maximum attainable temperature of superheating, the Boyle temperature and the critical compressibility coefficient of cesium, rubidium and potassium are correlated through the generalized van der Waals equation of state. This three-parameter equation differs from the known van der Waals equation of state by the modified attractive term. For cesium, rubidium and potassium, the ratios of the maximum attainable temperature of superheating to the Boyle temperature are estimated. The results of estimation are in agreement with experimental data. It has been established that cesium, rubidium and potassium obey the single-parameter law of corresponding states with the ratio of the maximum attainable temperature of superheating to the Boyle temperature as the thermodynamic similarity parameter.