You're allowed Cv comes out here for this adiabatic expansion, which is not a constant volume only because this is always true for an ideal gas.
绝热过程写下,这个式子是因为它对理想气体都成立,并没有用到等容过程的条件,只用了理想气体的条件。
dq=CvdT STUDENT: PROFESSOR BAWENDI: Well, let's see.
学生:在等容过程中:,对理想气体。
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