It's related to the heat capacity, the constant volume of heat capacity and something you could measure.

它联系了热能，恒容热容和一些,我们能够测量的物理量。

麻省理工公开课 - 热力学与动力学课程节选

Now, you know with constant volume, H now it's not going to be delta H that's U straightforward to measure, it's going to be dealt u, all right.

好，现在你们知道在体积恒定的条件下，我们得到的不是Δ,我们直接测量到的是Δ,好，但这基本上也是一样的。

麻省理工公开课 - 热力学与动力学课程节选

So, you do this measurement, you measure with the gas, you measure the pressure and the molar volume.

现在让压强趋于，现在测量气体的压强，和摩尔体积。

麻省理工公开课 - 热力学与动力学课程节选

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