So for the reversible process, the work done is the integral under the pressure volume state function, the function of state.

对可逆过程，做的功,是压强体积态函数曲线下，的积分面积。

麻省理工公开课 - 热力学与动力学课程节选

How many people vote for that this is a reversible process? I've got one vote back there two votes, three votes, four votes. Anybody else?

有多少人认为,这是一个可逆过程？有一个，两个，三个,四个，还有别的人吗？

麻省理工公开课 - 热力学与动力学课程节选

So a reversible process leads to requiring certain quantities to be maximized.

因此可逆过程要求,一些物理量要达到最大值。

麻省理工公开课 - 热力学与动力学课程节选

So w, the work is less for the irreversible process than the reversible process.

不可逆过程中系统对外界,做的功要比可逆过程时小。

麻省理工公开课 - 热力学与动力学课程节选

The reversible process is going to be colder because it has to expend more energy.

可逆过程降温更多,因为输出的能量更多。

麻省理工公开课 - 热力学与动力学课程节选

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。

麻省理工公开课 - 热力学与动力学课程节选

if it's a reversible process then the equality holds, but if it's irreversible, which means it happens spontaneously, T then dS is greater than this.

对于可逆过程，等号成立，但是如果是不可逆过程，这些不可逆过程是自发进行的，那么dS大于dq除以。

麻省理工公开课 - 热力学与动力学课程节选

Remember it's the external pressure that's important. In this case, because it's a reversible process, the external pressure turns out to be always the same as the internal pressure.

是过程非常缓慢,比如我把体积，从V1压缩到V2时，我做得十分缓慢,在过程中的任何一点。

麻省理工公开课 - 热力学与动力学课程节选

If it's a reversible process, we know the work is the area under the curve.

对可逆过程，功等于p-V图上。

麻省理工公开课 - 热力学与动力学课程节选

Let me first ask you this, is this a reversible or in irreversible process? Right, let me add one more piece of data here which I said in words but which is actually important to write down before doing the problem.

让我先问你们，这是可逆过程,还是不可逆过程？好,让我加上一点简要的,但是很重要的前提,【p1>p2】这是可逆的吗？

麻省理工公开课 - 热力学与动力学课程节选

I mean we can, we can sort of understand why OK, the total energy, if we measure it, we measure a process which is not reversible.

例如我们易于理解为什么，当试图测量一个不可逆系统的总能量，给出的或许。

麻省理工公开课 - 热力学与动力学课程节选

Adiabatic q equal to zero. It's also delta H 0 which is zero. The two didn't necessarily follow because remember, delta H is dq so p is only true for a reversible constant pressure process.

在这个过程中ΔH等于,绝热的所以q等于0，而ΔH也等于,这两个也不一定有因果关系,因为，记住，ΔH等于dq只有在恒压。

麻省理工公开课 - 热力学与动力学课程节选