That's entropy and the arrow of time.

这就是熵和时间之箭。

youdao

So, Boltzmann understood that and he explained how entropy is related to the arrow of time.

所以，波尔兹曼了解这一点并且他解释了熵是如何与时间之箭相关的。

youdao

The weird thing about the arrow of time is that it’s not to be found in the underlying laws of physics. It’s not there.

关于时间之箭奇怪的事情是在物理学的基本定律中并没有发现它，它不在那里。

youdao

p2 p1 is greater than p2. Then I want to reverse direction of time. I want the arrow of time to go so that the gas goes from p2 to p1.

一直推，一直推，p1大于,接下来我想让时间倒流,让气体从p2到p1。p2比p1小。

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This serves as a crude model of entropy, Smolyaninov says, representing the thermodynamic arrow of time.

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