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Line 1: − The potential energy associated with a substance.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>+ − + −
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Enthalpy is a measurement of heat in a system. An early definition of enthalpy "H" in terms of system energy "E", pressure "P" and volume "V" is this:
==References==
:<big><math>H = E + PV \,</math>
<references/>