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You do it so quickly that the heat flow between the inside of the bicycle pump and the outside is too slow compared to the speed at which you compress.
我们用力很大,于是压缩得很快,打气筒内外热传递的速度,与之相比要慢得多。
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So just go everywhere on my bicycle, really.
所以，我去任何地方只需骑上我的自行车，真的。
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So you start with the bicycle pump at one bar, let's say, right?
一个大气压，开始？
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Not everybody in this room can ride a bicycle.
在座各位并不都会骑自行车
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Do you ride a bicycle?
你骑自行车吗？
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But you don't compress it so quickly that you're not in there reversible process so you compress that if you were to feel the temperature of the air and you can feel it through the nozzle gives you an idea of the temperature of the air inside your bicycle pump.
但是压缩速度,也不能太快,否则就不是,可逆过程了,这样当压缩气体时,从喷嘴可以感受到,内部气体的温度。
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And that really is the bicycle pump.
这正是自行车打气筒的情况。
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That example I gave last time with the bicycle pump was not quite the right example.
上次我举打气筒的例子,是不太恰当的。
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But this time this really is the bicycle pump.
但在这里是很符合实际的。
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This is real, unlike the Joule coefficient which is very small so that most gases have tiny Joule coefficients. So if you do a Joule experiment, you hardly measure a temperature change. With real gases, here you do actually measure it. You can feel it with your finger on your bicycle tire.
系数那样小以至于,大多数气体的焦耳系数,都很小，所以如果你做焦耳实验,很难测量出温度的变化,对于真实气体，你可以测量它，你能通过手指按在,自行车轮胎上来感觉到它。
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