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It sounds pretty silly, but it's really important because it allows you to define a thermometer and temperature.
这听起来相当白痴，但是它确实很重要,因为它让你可以定义,温度计和温度。
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It allows you to define the concept of a thermometer. You have three objects, one of them could be a thermometer.
从热的物体流向冷的物体,由此我们可以定义温度，我们还可以用它来定义温度计：
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That's another invention of the 1600s, by the way-- the thermometer. And they learned that concept-- perfectly natural to us--temperature.
顺便说一下,温度计也是十七世纪的发明,那时候的人才刚刚开始理解温度的概念,虽然对我们来说这是个很自然的概念
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So, zeroth law, then, allows you to define the concept of temperature and the measurement of temperature through a thermometer.
因此第零定律，使你可以定义温度的概念,以及通过温度计,测量温度的方法。
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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。
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So, the active part of the thermometer could be water. It could be alcohol, mercury, it could be a piece of metal.
那么温度计的工作部分,可以是水可以是酒精，水银，可以是一块金属。
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That'll be inside our calorimeter. It's insulated, and there's still a thermometer, so we can measure the temperature.
被放置在量热计里面，它是绝热的，同样有一个温度计，让我们可以测量温度。
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All right, it turned out that this thermometer here wasn't quite perfect either.
事实上,这样定义出来的温标。
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Another experiment would be to mix two chemicals together and put a thermometer in and measure the temperature.
比方说做这样一个试验,将两种化学试剂混合然后测定反应温度
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And that property could be the volume, like if you have a mercury thermometer , the volume of the mercury.
这种性质可以是体积，如果你有水银温度计,水银的体积。
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So he grabbed his thermometer, and went and made a couple of measurements and discovered the first law of thermodynamics.
所以他拿来了温度计，进行测量,后来就发现了热力学第一定律。
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Great. So now we have this ideal gas thermometer, and out of this ideal gas thermometer, also comes out the ideal gas law.
好，现在我们有了理想气体温度计,由此还可以引出理想气体定律，我们可以得到这条，插值出的直线的斜率。
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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。
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All right, so now we have the makings of a good thermometer and a good temperature scale.
这一常数只决定于温度,于是我们现在,可以定义一个理想的温度计和温标了。
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But it's important to define that, and define something that's a thermometer.
但是定义这点很重要，要定义一个温度计。
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The ideal gas thermometer.
是波义耳定律。
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It's tabulated in books, and this we can measure p in the experiment. Delta p here is the change in pressure from the left side to the right side, and we can put a thermometer, measure the temperature before the experiment and measure the temperature after the experiment.
这列在书上，这个量我们在,实验中也可以测量，在这里Δ,是从左边到右边的压强变化，我们可以放一个温度计，去测量实验前的温度,再去测量试验后的温度。
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What we're really going to do in practice is we're going to measure, we're going to use our thermometer and say great, how much did the temperature change, right.
H1是零,实际上我们要做的,是用我们的温度计,测量温度改变了多少。
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