Question

define the relation between enthalpy h and internal energy u​

Answer 1

The change in the internal energy of a system is the sum of the heat transferred and the work done. At constant pressure, heat flow (q) and internal energy (U) are related to the system's enthalpy (H). The heat flow is equal to the change in theinternal energy of the system plus the PV work done.

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Answer 2

Explanation:

Enthalpy of a substance is defined as the internal energy of the substance + pressure energy per unit mass of the substance. The reason for defining such kind of relationship is that under constant pressure system the change of this property (enthalpy) denotes the heat added or removed from the system.