An experiment has been performed to investigate the chemical reaction between the liquid phases of the eutectic lithium-lead (Li17Pb83) and water. The reactants and products were constrained within a closed reaction vessel, allowing the extent of reaction to be determined from the partial pressure of the hydrogen reaction product. The data from the tests showed that the extent of reaction did not depend upon the initial water temperature. The data also indicated that the extent of reaction passed through a maximum as the initial liquid metal temperature was varied from 350 to 500 C, and a model was developed to explain this behavior.aWork performed at the University of Wisconsin-Madison.