So there's going to be a line that's going to connect the initial point to the final point, and that line mathematically is not going to be the same as this one here.

连接绝热过程,初末态的曲线的方程，和等温线的方程,也不会相同。

麻省理工公开课 - 热力学与动力学课程节选

That's the isotherm here.

等温线的方程了。

麻省理工公开课 - 热力学与动力学课程节选

If you want to write a function that describes this line here, it's pressure as a function of volume related to each other with this constant.

如果要写出描述这条等温线的方程,它的压强和体积,就通过常数C相联系起来。

麻省理工公开课 - 热力学与动力学课程节选