Saturation states of heavy water

A study has been made of the saturation properties of D2O from the triple point temperature to 325 °C, in the light of information on the saturation properties of H2O. Saturated liquid volumes have been determined by extrapolation to saturation pressure of relatively abundant liquid phase data (corrected to 100% D2O). Saturated liquid enthalpy has been determined by extrapolation of liquid phase specific heat data, and integration along the saturation line, allowing for the compressibility effect. Saturated vapor volumes have been determined by use of an extended virial equation formulated for H2O and corrected for D2O. Saturated vapor enthalpies have been determined by use of the Clapeyron equation, and compared to vapor enthalpies calculated from the extended virial equation. Saturated liquid and vapor volumes have been extrapolated to the critical temperature to allow an inference of the critical density.