An experimental investigation of the P-V-T properties of heavy water

A constant mass system has been developed to measure the P-V-T properties of light and heavy water for pressures up to the critical values. Heat was added to a given mass of water and temperatures and pressures were measured at steady state when the change of temperature was less than or equal to 0.01 degrees centigrade per hour. Changes in apparatus volume were functions only of temperature and were estimated from the coefficient of thermal expansion. Data is given for the vapour pressure of light and heavy water, from 200 to 300 degrees centigrade, and is compared with the predicted values of Bridgeman and Aldrich and Whalley. An equation for the saturated vapour pressure of heavy water as a function of temperature from 100 to 370 degrees centigrade is presented in the form of a Chebyshev polynomial