Measurements on the enthalpy of saturated heavy-water liquid were made for temperatures ranging from 90 to 350 deg F by means of a non-flow, continuous-heating calorimeter. Based on confirmatory tests conducted on light water, it is estimated that the heavy-water enthalpy measurements obtained in this paper are accurate to ±0.5 percent. The experimental data of this research is in reasonable accord with the data obtained by other investigators. It was also found that the difference between the heavy-water enthalpy-change values and the corresponding values for light water is a strong function of temperature varying from about 0.2 percent at 100 deg F to 3.5 percent at 350 deg F.

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