In first law of thermodynamics, internal energy U is defined, and it is used to predict...

In first law of thermodynamics, internal energy U is defined, and it is used to predict the magnitude of heat and work conversion. However, we actually use enthalpy(H) more than U.
What is the difference between U and H? And why a new thermodynamic function H is needed, even though U was first defined which is suitable for the first law?

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genius_generous answered 1 year ago

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