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Enthalpy of a reaction or energy change of a reaction D H, is the amount of energy or heat absorbed in a reaction. If the energy is required, D H is positive, and if energy is released, the D H, is negative.
The concept is frequently applied in physical sciences to, for example, chemical reactions, where thermal energy (heat) is converted to chemical bond energy. Endothermic (and exothermic) analysis only accounts for the enthalpy change (âH) of a reaction. The full energy analysis of a reaction is the Gibbs free energy (âG), which includes an entropy (âS) and temperature term in addition to the enthalpy.