Enthalphy is a measure of the total energy of a thermodynamic system. It includes the internal energy, which is the energy required to create a system, and the amount of energy required to make room for it by displacing its environment and establishing its volume and pressure. Enthalpy Calculator is used to calculate the heat transfer during a quasistatic process taking place in a closed thermodynamic system under constant pressure (isobaric process).
Enthalphy = U + PV
U is the internal energy (in joules),
p is the pressure of the system, (in pascals), and
V is the volume, (in cubic meters).