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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。
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And I have this adiabatic expansion where p external is really small.
这时的情况,跟理想气体的。
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Here comes an adiabatic expansion, to point three.
通过绝热膨胀到，第3点。
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dq It's an ideal gas in adiabatic expansion 0 dq is equal to zero.
说明,等于。
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What happened to the temperature in that expansion? It's an adiabatic expansion.
温度要,如何变化？
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Our constraint is going to be an adiabatic expansion or compression.
现在约束改成了,绝热膨胀，或者压缩。
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We know in an adiabatic expansion the system's going to cool.
我们知道在绝热膨胀过程中,系统温度会降低。
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Then we're going to have an adiabatic expansion.
然后一个绝热膨胀过程。
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Adiabatic expansion means you can't use this.
这与等容的。
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It's and adiabatic expansion.
使气体温度。
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Going from two to three, that's an adiabatic expansion, so q is equal to zero in that step.
从第二点到第三点，是绝热膨胀，因此q等于零。
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