Isochoric Heat Capacity of Heavy Water at Subcritical and Supercritical Conditions

The heat capacity of heavy water was measured in the temperature range from 294 to 746 K and at densities between 52 and 1105 k g . m - 3 using a high-temperature, high-pressure adiabatic calorimeter. The measurements were performed at 14 liquid and 9 vapor densities between 52 and 1105 kg.m- 3 . Uncertainties of the measurements are estimated to be within 3 % for vapor isochores and 1.5% for the liquid isochores. In the region of the immediate vicinity of the critical point (0.97