Mr. Reid noted that: "Our galaxy probably has 4, not 2, spiral arms of gas and dust that are forming stars."

VOA: special.2009.01.20

Let's build this up. Let's see where this comes from, where these parameters a and b comes from. So, the first thing we're going to do is we're going to take our gas in our box, let's build a box full of gases here.

参数a和b有什么含义,首先，假设研究的气体,都在一个容器里,容器里充满了气体,这些是气体分子。

麻省理工公开课 - 热力学与动力学课程节选

Just like our substance doesn't care where the gas is. It's kind of universal.

与压强无关的参考点,那就再好不过了。

麻省理工公开课 - 热力学与动力学课程节选

OK, so let's take our Van der Waal's gas.

好的，让我们看看范德瓦尔斯气体。

麻省理工公开课 - 热力学与动力学课程节选

nRT So, dp/dT, for our ideal gas, at constant volume, remember pV is nRT.

对于理想气体状态方程pV等于，所以对理想气体。

麻省理工公开课 - 热力学与动力学课程节选