OK, you use the ideal gas law, etc., then you get a relationship that connects the pressure and the temperature, like here we got a relationship that connected the temperatures and the volumes together.

我们会得到，一个联系初末态,的压强和温度的，关系式,就像这个联系过程中。

麻省理工公开课 - 热力学与动力学课程节选

let's use the ideal gas law to get rid of the temperature.

我们用理想气体定律,来消去温度。

麻省理工公开课 - 热力学与动力学课程节选

Just use this as an ideal gas here.

我们来看。

麻省理工公开课 - 热力学与动力学课程节选

Now, if you're an engineer, and you use the ideal gas law to design a chemical plant or a boiler or an electrical plant, you know, a steam plant, you're going to be in big trouble.

比如说锅炉，蒸汽机,我们会遇到一个大问题：,我们设计的机器将无法运作，因为对大部分实际气体。

麻省理工公开课 - 热力学与动力学课程节选

So what happens then we're going to use the ideal gas law. So it's approximately delta u plus delta nRT. That's a constant. That's a constant.

我们现在要应用理想气体物态方程,这个近似等于ΔU加上Δ,这是常数，这是常数。

麻省理工公开课 - 热力学与动力学课程节选