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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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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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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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You take the third one, and you go from one to the other, and you see whether heat flows, when you touch one object, the middle object, between those two objects.
第三个物体就可以作为温度计,将它与第一个物体接触，再与第二个物体接触，观察它们之间热量流动的方向。
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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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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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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, 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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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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And if you go back into the 1800's when thermodynamics was starting, there were a zillion different temperatures scales Everybody had their own favorite temperature scale The one that we're most familiar with is the centigrade or Celsius scale where mercury was the substance, and the volume of mercury is the property.
如果你回头看看19世纪温度计,刚开始使用的时候，那时有不计其数的不同温标,每个人都有他们自己最喜欢的温标,我们最熟悉的是,摄氏温标，用水银,作为工作物质，水银的体积是所用的性质。
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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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