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So now we have a relationship between the ratios of these volumes that are reached during these adiabatic paths.
现在我们有了一个联系,这些绝热过程中,体积比的关系式。
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Yet, the temperature goes up. So, I can have a temperature change which is an adiabatic temperature change.
它与外界不会，有物质或者能量的流动,然而系统的温度升高了。
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Adiabatic can be either reversible or not, and we're going to do that probably next time or two times.
绝热过程可以是可逆的，也可以不是，我们可能会在下一次或下下次课上,研究这个问题。
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Adiabatic meaning there's no heat involved, and we're going to see how that differs from the isothermal expansion and compression.
绝热意味着没有热量的传递，我们将看到它,与等温过程的区别。
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And you already saw last time there was this relationship between the temperature and volume changes along an adiabatic path.
是条绝热路径，而上次你已经看到,沿着绝热路径温度和体积,的变化有这个关系。
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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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Adiabatic means there's no heat transferred in or out of the system.
绝热意味着系统,与化境没有热交换。
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Be careful. Suppose we are doing an adiabatic process.
假设我们在研究绝热过程。
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So we've got our reversible adiabatic path right.
那么我们有了这条可逆绝热路径。
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As long as it's reversible, you know what the efficiency has to be, and in principle, you could break it down into a bunch of steps that you could formulate as isothermal and adiabatic.
只要这个循环过程是可逆的，你们知道效率是多少，从理论上说，可以将总过程,分解成一系列绝热,和等温的小过程。
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dq=0 But if it's adiabatic, then dq is equal zero, du=dw and for an adiabatic process, then du is equal to dw.
但如果它是绝热的，那么，因此对于绝热过程。
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You've just done an adiabatic compression of the ideal gas, you can pretend there is an ideal gas.
这就是对理想气体的,绝热压缩，---我们把空气近似作为理想气体处理。
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Okay two going to three that's this, it's adiabatic, right.
从二点到三点，是绝热过程。
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Yes, exactly, it's adiabatic, right constant pressure.
对，没错，它是绝热的。
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The boundary is impervious to transfer of heat like a thermos Anything that happens inside of the thermos is an adiabatic change because the thermos has no connection in terms of energy to the outside world.
边界不能传递热量,像热水瓶一样,热水瓶里发生的任何事,都是绝热变化,因为热水瓶与外部世界,没有能量方面的联系。
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OK, so now we're going to do the same kind of experiment, but irreversibly. An irreversible adiabatic.
现在来在,不可逆的条件下，完成相同的实验。
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So this is still adiabatic. It's insulated, but now it's constant volume, OK.
这仍然是绝热的，是隔热的，但现在它的体积是恒定的。
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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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Now,this is a reversible adiabatic path, so there's a relationship that I'm sure you'll remember.
现在是可逆绝热过程，因此这里有一个关系式,我相信你们还记得。
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It's set up to be well-insulated so it's adiabatic.
所以它是绝热的。
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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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And it's still adiabatic, but now it's constant volume. And it's also reversal right.
它仍然是绝热的，但现在是,在等体条件下，它也是可逆的。
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Now to make that happen, it's not adiabatic, right. If I wanted to do that, I'd need a heating element or something to cool, so I could make that temperature change happen, right.
要实现这点，它就不会是绝热的，对吧，如果我想做到这点,我需要一个加热元件或什么制冷的东西,这样我才能让温度变化。
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So your time scale it just fast enough that this is basically an adiabatic compassion.
你的时间足够快以至于,基本上是一个绝热过程。
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We're pretty much done with our definitions STUDENT: Was adiabatic reversible?
各种定义,学生：绝热过程是可逆的吗？
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And this is in an isolated, in an adiabatic container.
这应该是个很简单的问题，桨轮处在一个与外界隔离额绝热环境中。
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I'm going from T1 to T2, and I have two ways to go here. One is non-adiabatic.One is adiabatic.
从T1升温到T2有两类途径,非绝热，或者绝热。
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I Let's label this one. It is adiabatic.
我们把这个标为。
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And now we're going to have another adiabatic step, an adiabatic compression.
现在我们进行另外一步，绝热收缩过程。
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