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Enthalpy, H is the name given to a grouping of thermodynamic parameters: H = U + PV. The enthalpy per unit mass is the specific enthalpy, h = u + pv. It is a function of the state of the system. In a general thermodynamic process: dh = du + pdv + vdp = dq + vdp, where dq is the path dependent heat transfer to the system. For constant pressure processes, dp = 0 and dq = dh. The enthalpy change in a constant pressure process is, therefore, a measure of the heat interaction between the system and its surroundings. |
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