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Definition of Heat of hydration

Heat of hydration Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
( Hhyd) The change in enthalpy for the processA(g) A(aq)where the concentration of A in the aqueous solution approaches zero. Enthalpies of hydration for ions are always negative because strong ion-water attractions are formed when the gas-phase ion is surrounded by water.
Moxie International's Glossary of Concrete Terms
The quantity of heat expressed in calories per gram, evolved upon complete hydration of portland cement at a given temperature.