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I'm going to write it like this three moles of hydrogen which is a gas one bar 100 degrees Celsius.
我会写成这样：,三摩尔氢分子，气体,1巴，100摄氏度。
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For a real gas it depends on more than the temperature STUDENT: Are there any other constraints similar to that .
而对实际气体，这是不对的,它的内能不仅仅依赖于温度,学生：有其他,类似的约束吗？
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Let's look at the energetics of one of those electrons crashing into a hydrogen atom inside the gas tube.
我们一起来考察一下,其中的一个电子的能量,在阴极射线管中,撞击到氢原子上。
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No one was injured in a blast which was attributed to the buildup of gas by one town official."
镇政府天然气泄漏导致爆炸,所幸并无一人受伤",因而并无人员在爆炸中受伤]
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the subject is accepted and extended "You'd win the war with a new kind of poison gas!"
大家喜欢这内容，因而继续,“你在一次新型毒气战争中胜出“
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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？
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We talked about this reaction here where we had chloride ion in the gas phase plus sodium ion in the gas phase.
我们在讨论这一个反应,我们有气相的氯原子,与气相的钠原子接触。
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And then I am going to take sodium gas and I am going to make this into sodium gas plus electron.
接下来，将气态的钠,转化为,带正电的气态钠。
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This is the diagram taken right from your text, there are the two electrodes coming in and this is atomic hydrogen in the gas tube.
这是从教科书上复制下来的图表，这里有两个电极进来,这是气体管中的氢原子。
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This needs to be stressed that this is the ideal gas case. Now regular gases, real gases fortunately as I said, don't obey this.
需要强调的是这是对理想气体而言的,普通气体，真实气体，就像我说过的,不遵循这个规律，这是非常重要的。
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Now, we saw before, or really I should say we accepted before, that for an ideal gas, u was a function of temperature only.
我们已经看到,或者说我们已经接受这样一个事实，即理想气体的内能只和温度有关。
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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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This quantity is exactly zero for an ideal gas and we'll discover why eventually it has to do with what we mean by an ideal gas it turns out.
对理想气体它是零,这点我们接下来会知道是,为什么，这与为什么我们叫它理想气体有关。
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All right, then as I push through, I'm going to start with all of my gas on this side, and at the end I'm going to have all the gas on the other side.
好的，随着我的推动,刚开始这些气体全在这一边,到了最后，这些气体全在另一边。
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Here just two, so we changed the number of moles of gas by three. All right, how much did it matter, right?
所以我们将气体的摩尔数,改变了3摩尔，好，它会起多大作用？
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du, it's an ideal gas. So this is Cv dT and of UB course we can just integrate this straight away.
因此这是CvdT，当然我们可以,直接算出这个积分，那么△
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