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Abstract
An ultrasonic dilatometer has been used to measure the volume of a specimen of liquid rubidium as a function of temperature (up to 200°C) and pressure (up to 1·38 kbar). The results may be fitted by a polynomial with nine terms. A curve of pressure versus temperature at constant volume may be deduced from the polynomial, and it is shown that this curve is in good agreement with predictions based upon the Weeks–Chandler–Andersen formulation of the perturbation theory of liquids, using an effective ion–ion potential for rubidium derived from Ashcroft's empty-core pseudopotential and Shaw's approximation for electron exchange and correlation.