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It's true for any gas, and if I remove this limit here, r t is equal to p v bar, I'm going to call that an ideal gas.
这样的气体被称作理想气体,这就是理想气体的性质，理想气体的涵义是什么？
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So the first path then, the first path, 1 constant volume constant V, so I'm going to, again, let's just worry about energy.
首先，是路径，等压过程。
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D-A-V-I-D I'm not hardcoding in D-A-V-I-D anymore but I can still use a variable.
我不再把名字写死为,而是用一个变量来代替。
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Now we're going to hear Beach Boys, IV I guess,with a three-chord chord progression and it's going to be sub-dominant , V dominant , I tonic .
而现在我们来听听貌似是沙滩男孩，三和弦进行，然后将会是次属音，属音，和主音。
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Suppose that in 2010, v.163.com I see a car in a junk lot.
假设2010年，更多公开课到,我在废品站,看到一辆车。
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But before you even do that, I want to define for you an important concept, which is the velocity at a given time, v .
但在这之前,我要给你们定义一个重要的概念,也就是给定时刻的瞬时速度v
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Delta v is going to be negative. w is going to be negative. Sorry, I got it backwards again.
这样就对外界做了功,这时候ΔV是正的。
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T p V I've got three variables, T, p and V.
一共有三个变量：
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And if I draw a diagram on a T-V diagram of T-V V1 I'm starting with some V1 here.
画出过程的,图，what，I’m，doing，here，初态是。
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So that's I,IV,V,I.
所以是一，四，五，一。
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So Arg V bracket I, gives me the Ife string that I typed in.
那么Argv，把我刚键入的字符串Ife传给我。
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D-A-V-I-D It's not copying the F-O-O or the D-A-V-I-D.
它不是复制F-O-O，或者。
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Okay. Now watch what happens as we continue with this I,VI,IV,V,I progression.
好，在这一段I-VI-IV-V级的和弦进行后，音乐发生了什么变化呢。
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Okay. So that's the "Duke of Earl" progression: the basic I,VI,IV,V,I.
好，这就是Duke，of，Earl这首歌的和弦进行，I，VI，IV，V，I级。
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I'm pressing on the gas. So I expect that to be a positive number. The pressure is constant 0 p. The V goes from V1 to zero.
我们对气体加压,所以这应该是一个正数,压强是常数，p，V从V1变成。
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So instead of p, here I'm going to put nRT over V.
于是把p写成。
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