So when I expand this gas adiabatically and it cools down, why do you think it might cool down?
现在我们知道了气体绝热膨胀时,温度会下载,为什么会降温?
T2 So this is an isotherm at some different temperature T2, a cooler temperature, because this was an expansion.
这个绝热过程的温度是,比T1低,因为这是个膨胀过程。
Now let's talk about some simple observations on isothermal gas expansions.
接下来我们讨论几条,关于绝热膨胀的性质。
Here comes an adiabatic expansion, to point three.
通过绝热膨胀到,第3点。
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。
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。
Then we're going to have an adiabatic expansion.
然后一个绝热膨胀过程。
You have an expansion.
绝热膨胀。
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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