In
thermodynamics and
molecular chemistry, the enthalpy or heat content (denoted as H or ΔH, or rarely as χ) is a quotient or description of
thermodynamic potential of a
system, which can be used to calculate the "useful" work obtainable from a
closed thermodynamic system under constant pressure. The term enthalpy is composed of the prefix en-, meaning to "put into", plus the
Greek word -thalpein, meaning "to heat", although the original definition is thought to have stemmed from the word, "enthalpos" (ἐνθάλπος). It is often calculated as a differential sum, describing the changes within
exo- and
endothermic reactions, which minimize at equilibrium.
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