The total heat content of a system at constant pressure is

Enthalpy is a thermodynamic property of a system that represents the total heat content when the system is at constant pressure. It is a useful concept in understanding the energy changes that occur during various physical and chemical processes. Enthalpy is denoted by the symbol ‘H’, and it includes the internal energy of the system along with the energy required to displace its surroundings in order to make room for the system at constant pressure.