for the ideal gas it「s this.
对理想气体就是这个。
all right, next time we」re going to talk about a much better scale, which is the ideal gas thermometer and how we get to the kelvin scale.
好,下次我们,会讲一种好得多的温标,关于理想气体温度计,和开氏温标的导出。
v so we can, instead of having the volume of the gas here, we can use the ideal gas law.
所以我们可以在这里不保留这个,而是代入理想气体方程。
let「s try it with a different equation of state, that isn」t quite as simple as the ideal gas case.
考虑一个不同的状态方程,这状态方程不像理想气体状态方程那么简单。
this quantity is exactly zero for an ideal gas and we「ll discover why eventually it has to do with what we mean by an ideal gas it turns out.
对理想气体它是零,这点我们接下来会知道是,为什么,这与为什么我们叫它理想气体有关。
so from measured equation of state data, or from a model like the ideal gas or the van der waal」s gas or another equation of state you know this.
所以,从测量的到的状态方程的数据,或者从状态方程模型比如理想气体方程,范德瓦尔斯方程或者其他状态方程,我们就可以知道。
ideal gas would be the same temperature.
而理想气体的话两边温度将一样。
we just treated the one case of an ideal gas as the temperature is reduced.
我们只是讨论了温度下降时,理想气体的行为。
you have to have a gas in there because of the ideal gas for the approximation that goes in here.
气体必须出现在相变中,因为这里出现了理想气体近似。
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。
and that「s because this is different from what it is in the ideal gas case.
因为这一项,和理想气体中的对应结果不同。
in other words, we」re taking advantage of the fact that we now know that quantity. in the case of the ideal gas we just have a simple model for it.
换句话说,我们可以利用我们已经,了解这个物理量的这个优势,对理想气体我们有一个简单的模型。
and the temperature scale that turns out to be well-defined and ends up giving us the concept of an absolute zero is the ideal gas thermometer.
比如理想气体温标,它有精确的定义,并能引出绝对零度的概念,今天我们就先来谈谈它。
so if we have an ideal gas, and certainly if we「re going to assume an ideal liquid mixture, we can safely assume that it」s an ideal gas above it.
那么如果我们有理想气体,当然如果我们设想,理想液体混合物,我们就能放心地,假设上面是理想气体。
and we saw that, you saw that the joule coefficient for an ideal gas was zero.
我们会发现,你们也会发现,理想气体的焦耳系数是零。
what that means is, i've got my ideal gas in some container.
这意味着,我们把理想气体装在一个容器中。