Enthalpy, often denoted as , is a thermodynamic property that represents the total heat content of a system at constant pressure. It includes the internal energy of the system plus the product of pressure and volume. Enthalpy is particularly useful in systems where constant pressure conditions are maintained, such as in open systems.
The formula for enthalpy is:
Where:
- is the enthalpy (SI unit: joules, J).
- is the internal energy of the system (SI unit: joules, J).
- is the pressure of the system (SI unit: pascals, Pa).
- is the volume of the system (SI unit: cubic meters, m³).
The SI unit of enthalpy is joules (J).