Give definitions of internal energy and enthalpy.
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internal energy means the energy system arising from the relative positions and interactions of its parts .
enthalpy means the thermodynamic quantity equivalent to the total heat content of a system . It is equal to the internal energy of the system plus the product of pressure and volume .
enthalpy means the thermodynamic quantity equivalent to the total heat content of a system . It is equal to the internal energy of the system plus the product of pressure and volume .
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