### Formula

U

the internal energy of the system

H

the enthalpy of the system

p

the pressure at the boundary of the system

V

the volume of the system

U

the internal energy of the system

H

the enthalpy of the system

p

the pressure at the boundary of the system

V

the volume of the system

Enthalpy 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.

H

p

V

U

Precision

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