A correlation of critical temperature of alkali metals
The critical temperature and the Boyle temperature of caesium, rubidium, and potassium are correlated on the basis of the generalised van der Waals equation of state. This generalised equation differs from the well-known van der Waals equation of state by the introduction of a third parameter in the expression for molecular pressure. The Boyle temperatures of caesium, rubidium, and potassium are estimated. Caesium, rubidium, and potassium have been found to obey a single-parameter law of corresponding states with the reduced Boyle temperature as the thermodynamic similarity parameter.