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| 1. |
Why cp is always greater than cv |
| Answer» The heat capacity at\xa0constant pressure CP\xa0is\xa0greater than\xa0the heat capacity atconstant volume CV\xa0, because when heat is added at\xa0constant pressure, the substance expands and work. QV =\xa0CV\xa0△T = △U + W = △U because no work is done. Therefore, dU =\xa0CV\xa0dT and\xa0CV\xa0= dU dT . | |