This equation is known as the ideal gas law.

这个等式被叫做理想气体定律。

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。

The ideal gas law may turn out to be a very good approximation.

理想气体定律结果，就是一个很好的近似。

It's like the ideal gas law, and one could know that in principle.

有点像理想气体定律，我们可以从原理上理解这点。

I know I only need 2, so I can relate dV dV to dp through the ideal gas law.

我只需要两个就够了，因此可以用，理想气体状态方程消去。