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So what they do is, they're describing how these thermodynamic properties change, in terms of only state functions and state variables.
他们的作用是描述,随着状态函数和状态变量的变化，系统的热力性质如何变化。
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So now let's go around the cycle and just compare notes on what happens to the thermodynamic quantities as we do that.
现在让我们推导一下这个循环,比较一下这个过程中,热力学性质的变化。
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So we're going to go through a thermodynamic cycle, and here's what I want to calculate when we do this.
那么我们要推导,一个热力学循环,这是这个过程中我要计算的东西。
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And I wanted to do it a different way which is a little bit convoluted, but it introduces the idea of a thermodynamic cycle, and it's something that we're going to use a lot in the class.
现在我将用另一种,有些复杂的办法来推导这一关系，在这一过程中引入,我们今后会常接触到的,热力学循环的概念。
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That is, in terms of equations of state. For any material Then we would really be able to essentially calculate anything. Anything thermodynamic.
换句话说，利用任何一种物质的状态方程,我们就能够实质上,计算所有物理量，所有热力学量。
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OK, All right, so these are the thermodynamic quantities that you're familiar with already.
好，这些是你们已经,熟悉了的热力学量，让我们很快地。
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If it's not, then you're going to have trouble describing it using thermodynamic properties.
如果它不是，那么用热力学性质去,描述它就要有麻烦了。
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now let's go back to each of our individual steps and look, based on what we know about how to evaluate the thermodynamic changes that take place here, let's look at each one of the steps and see what happens.
让我们回到循环中的每一步,然后看看，基于我们已有的知识,来估计一下,发生的热力学变化，让我们看,循环中的每一步发生了什么。
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And that's the zeroth law thermodynamic.
这就是热力学第零定律。
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But the other reason to go through the thermodynamic cycles and really to develop great facility with them is because there are just an awful lot of things in nature and things that we build that run in cycles, where we want to calculate the thermodynamics, right.
但是要推导热力学,循环并为之发展一套,完善方法的另外一个原因是,自然界中或人造的那些,我们想计算它们的热力学的东西,有很多是以循环的方式运作的。
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