We're not going down on the coexistence curve any more.
我们现在不在共存曲线上。
But first let me remind you what the coexistence curve is.
首先我要提醒你一下什么是共存曲线。
And then over here, we look at the gas phase coexistence curve.
然后到这儿，我们看气相共存曲线。
And once we reach point two, then we find a coexistence curve.
一旦我们到达第二点，就有一条同时存在的曲线。
Because, remember, what we said is let's raise the pressure until we just start being on the coexistence curve.
因为，请记住，我们说的是提高温度，直到到达共存曲线。
So this is yB of one. It's the same as yB of two, I'm just raising the pressure enough to just reach the coexistence curve.
所以这是yB，与二点的yB相同，我们把温度提高到，足够高以致达到共存曲线。
If you just barely get to the coexistence curve, of course then you could see how much material you've got in the two phases.
如果你只是刚好到达曲线，当然那样你能看到你在两相中，各有多少物质。
But the point is, the derivation doesn't yield a linear relationship for either the gas or the liquid part of the coexistence curve.
关键点是，推导的结果不是线性的，对于共存曲线的气体，和液体部分都是这样。
So then, in a practical way, it's possible to walk quite far along the distillation, the coexistence curve, and distill to really a high degree of purification.
如此反复，实际过程中，可以沿着，共存曲线蒸馏很久，然后提纯到一个很高的纯度。
So then, in a practical way, it's possible to walk quite far along the distillation, the coexistence curve, and distill to really a high degree of purification.
如此反复，实际过程中，可以沿着，共存曲线蒸馏很久，然后提纯到一个很高的纯度。
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