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这是依数性。This is a colligative property.

那四种依数性到底是什么？OK what are the four colligative properties?

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现在我们开始来学依数性。So we're going to start colligative properties.

关于共沸混合物，有问题吗？,接着我们要讲依数性？Any questions on azeotropes, before we get to colligative properties?

一共有4种依数性，你们已经知道它们是什么。There are four colligative properties, and you already know what they are.

当我们考虑依数效应时，我们从化学势的角度出发。When we get to the colligative properties, we'll attack it from the point of chemical potentials.

你们都在用这些依数性,每天日常生活。And these colligative properties are properties that you use all the time in your day to day life.

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这是依数效应之间,相互联系的,第一个暗示。But this is sort of the first indication that these colligative properties are all connected to each other.

从自由能和依数特性的原理出发阐明了结冰相变点下降的机理。Expounds the mechanism of freezing point depression from the viewpoint of free energy and colligative properties.

你可以利用这个定律的第一个地方,是我们的第一个依数效应,在这个效应中蒸汽压下降。And the first thing that you can use this for is to look at your first colligative property which is vapor pressure lowering.

这一节课我会讲到,第四个常见的依数现象，即渗透压。And today I want to start by going through the fourth colligative property that's commonly seen, what called osmotic pressure.

依数现象是这样一种现象,当你把物质混合在一起的时候,你不会得到纯物质,而是得到混合物质。Colligative properties are the properties like the vapor pressure, lowering when you have a mixture in a liquid, instead of having a pure substance you have amixture of substances here.