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

If I'm working under conditions of constant temperature and volume, that's very useful.

如果在恒定的温度和体积下,进行一个过程，这是非常方便的。

麻省理工公开课 - 热力学与动力学课程节选

If I look at different points in my container during that path, I'm going to have to use a different value of pressure or different value of temperature That's not an equilibrium state, and that process turns out then to be an irreversible process.

如果我要研究在路径中容器里的,不同的点，我就得在容器里不同的点上使用,不同的压强值,或不同的温度值,实际上这不是个平衡态，这个过程是,不可逆过程。

麻省理工公开课 - 热力学与动力学课程节选

That's because the body's hormone levels (such as cortisol) vary during the day and cause a person's temperature to be the highest between about 4 and 6 p.m. and lowest around 6 a.m.

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