what is the physical meaning of enthalpy?
Enthalpy is a thermodynamic function of a system, equivalent to the sum of the internal energy of the system plus the product of its volume multiplied by the pressure exerted on it by its surroundings. The term enthalpy is composed of the prefix en-, meaning to “put into” and the Greek word -thalpein, meaning “to heat”, although the original definition is thought to have stemmed from the word, “enthalpos” . It is often calculated as a differential sum, describing the changes within exo- and endothermic reactions, which minimize at equilibrium. In thermodynamics and molecular chemistry, the enthalpy or heat content is quotient or description of thermodynamics potential of a system, which can be used to calculate the useful work obtainable from a closed thermodynamics systems under constant pressure.
