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。

麻省理工公开课 - 热力学与动力学课程节选

So, you need some sort of property, something you can see, something you can measure, that tells you that heat has flowed.

所以，你需要某种性质，某种你能看到，能测量的东西，它会告诉你热量发生了流动。

麻省理工公开课 - 热力学与动力学课程节选

And you can see what the heat involved in a process like that is as well.

你就能看到在类似这样的,过程中热量是如何变化的。

麻省理工公开课 - 热力学与动力学课程节选

There's no change in them, and then we also looked at some at non-state functions, work and heat, and saw that those aren't zero going around a cycle. Of course you can do work in a cyclic process, and heat can be exchanged with the environment at the same time.

它们不会有变化，然后我们研究了,一些非态函数，功和热量，并看到,沿着循环行进一周的话,它们并不是零，当然你可以在,一个循环过程中做功，而同时热量可以在系统,与外界环境之间进行交换。

麻省理工公开课 - 热力学与动力学课程节选

This is why people right tables and tables of H delta H's. Why you have delta H's from all these reactions, because this is basically the heat and the heat is something we can measure, we can control. We can figure out how much heat is going in and out of something.

这就是为什么人们一再提出ΔH的原因,为什么在所有的反应中你都能看到Δ,因为它就是热量，而且热量,是一种我们可以测量并且控制的东西，我们可以测量出有多少热量,从一些东西里面放出或被吸收。

麻省理工公开课 - 热力学与动力学课程节选