它的循环过程，叫做卡诺循环，过程如下：，这是个压强体积系统。

And the cycle it's going to undertake is called a Carnot cycle, and it works the following way: we're going to do pressure volume work.

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任何不可逆过程中，效率是小于的卡诺循环。

For any irreversible process, the efficiency is less than that of the Carnot cycle.

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这就是说，卡诺循环是一个理想化的，因为没有真正的发动机过程是可逆的，所有真正的物理过程牵涉到一些熵的增加。

This means that the carnot cycle is an idealization since no real engine processes are reversible and all real physical processes involve some increase in entropy.

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如果回到卡诺循环，它是由一系列可逆过程组成，我们将它，和不可逆过程的情况相比较。

Now, if we go back to our Carnot cycle which is a set of reversible paths, it's useful to compare this to what happens in an irreversible case.

youdao

如果回到卡诺循环，它是由一系列可逆过程组成，我们将它，和不可逆过程的情况相比较。

Now, if we go back to our Carnot cycle which is a set of reversible paths, it's useful to compare this to what happens in an irreversible case.

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