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The heat capacity at constant pressure CP is greater than the heat capacity at constant volume CV , because when heat is added at constant pressure, the substance expands and work. QV = CV △T = △U + W = △U because no work is done. Therefore, dU = CV dT and CV = dU dT .

Heat capacity at constant volume and pressure | Physics | Khan Academy

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Heat capacity at constant volume and pressure | Physical Processes | MCAT | Khan Academy

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Specific Heat - Specific Heat At Constant Volume - Specific Heat At Constant pressure

In this video, I explained