And the path that I'm describing then, let's assume that we're raising the temperature up is this path right here.

经过一个，等压过程,路径就是这样。

麻省理工公开课 - 热力学与动力学课程节选

P dV is equal to R dT. pV = RT for 1 mole, pdV=RdT so I just take dV here.

对等压过程，那么。

麻省理工公开课 - 热力学与动力学课程节选

Path number 2 on my diagram it's a reversible, this path number 2, it's a reversible constant pressure path.

路径，首先是一个，等压过程。

麻省理工公开课 - 热力学与动力学课程节选

This is just an equality. I have a constant pressure dH process. This term here is equal to zero.

这是一个等式，这是个恒压过程,这项等于零，这意味着。

麻省理工公开课 - 热力学与动力学课程节选

So then, going from the initial to final states with a red path, ou start with an isobaric processand then you end with an isothermal process.

因此沿着,这条红色路径，你从一个等压过程开始,以一个等温过程结束。

麻省理工公开课 - 热力学与动力学课程节选

So, this path right here from this top red path is an isobaric process.

所以上面这条红色的路径,就是个等压过程。

麻省理工公开课 - 热力学与动力学课程节选

If you have an isobaric you're going to have to calculate where the energy changes, and that's a calculation that's likely on the homework and very like on an exam as well, too.

在等压过程中,我们需要计算能量的变化，我们在作业,和考试中,就会遇到这类问题。

麻省理工公开课 - 热力学与动力学课程节选

So the first path then, the first path, 1 constant volume constant V, so I'm going to, again, let's just worry about energy.

首先，是路径，等压过程。

麻省理工公开课 - 热力学与动力学课程节选

This depends on the path. It tells you right here the path is constant pressure. These don't depend on the path, right. V doesn't care how you v get there. u doesn't care how you get there.

这由变化的具体路径决定,这个小脚标表明过程是恒压的,这些量都与具体路径无关,即不管是通过什么路径使得体积变化为Δ

麻省理工公开课 - 热力学与动力学课程节选

So that's going to have to be a constant pressure path.

它应当包含,一个等压过程。

麻省理工公开课 - 热力学与动力学课程节选