Physical significance of enthalpy in thermodynamics
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Look enthalpy has no perfect definition... But inorder to feel what exactly enthalpy is u should know what is internal energy...
Internal energy in a simple way can be defined as the energy possessed by a fluid in closed system.
Know H(enthalpy) =U(internal energy) +PV(flow work)
PV is called flow work i.e it is the energy that is required to move a fluid with pressure P and specific volume V.... So energy(excluding K. E and P. E) that is possed by fluid while flowing (that is in open system) is enthalpy.
And In case of bodies which are incompressible like solids, since they can't flow therefore “PV=0” and hence for them enthalpy is equal to internal energy possessed by them.
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