Enthalpy

Enthalpy
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Enthalpy is a term in thermodynamics that states the amount of internal energy of a thermodynamic system plus the energy used to do work. Enthalpy can not be measured, which can be calculated is the value changes. Mathematically, the enthalpy change can be formulated as follows:

ΔH = ΔU + PΔV

where:

     H = enthalpy of the system (joules)
     U = internal energy (joules)
     P = pressure of the system (Pa)
     V = system volume (m ^ 3