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**Unformatted text preview: **T, if we assume a constant pressure Using this relation, the first law of thermodynamics can be rewritten as or However, the internal energy U depends only on the temperature and not on how the volume and/or pressure is changing. Thus, U/ T = 3/2 n R = n C V . The previous equation can therefore be rewritten as or We see that C p C V ....

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