Discussion
Which quantity is enthalpy?
Answer: B
Enthalpy combines the internal energy with the flow work, and its change at constant pressure equals the heat supplied. That is why the specific heat at constant pressure appears so often in atmospheric work, where processes are frequently isobaric or nearly so. For an ideal gas the enthalpy, like the internal energy, depends only on temperature. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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