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Again they've just done that experiment and seen the effects of that on the point measurement with the whole pro.
通过实验,他们便能看到其效果,通过在整个过程中,对点的测量。
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We could just collect a bunch of data. For a material .What's the volume it occupies at some pressure and temperature?
对一种物质我们可以得到一系列测量数据,在给定的温度和气压下,它的体积是什么？
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They're actively engaged in the material, actually seeing the phenomena, by making measurements of real world experiments.
学生们能自主地参与到物质中，看见真切的现象，通过对真实世界实验,做出测量。
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If you were to just talk into an oscilloscope that measured your sound vibrations, there are no pauses between the words.
如果你对着,测量声震的示波器讲话,你会发现在单词间并没有停顿
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As we said, Newtonian mechanics does work in most cases, it does work when we're discussing things that we can see, it does work even on things that are too small to measure.
在大部分情况下都适用,对我们可以看到的东西,它都能适用，甚至对一些小到,无法测量的东西它也可以适用。
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Imagine then from now on, we can find the mass of any object, right?
假设从现在开始,我们就能测量任何物体的质量了,对吧
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One is how important it is to have more accurate measurement and how important it is for scientists to get a better handle on what people are eating.
其一是精确测量,是多么重要,对科学家来说,更好的处理人们吃了什么有多重要
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And he was very proficient at measuring atomic mass.
他对测量原子质量很精通。
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But if you touch the valve going into your tire which basically measures the temperature of the air going into your tire, that is getting hot, right.
以至于浑身发热,如果你摸气筒的阀门,相当于近似测量了进入轮胎的气体的温度，它会很热，对吧。
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And again there, too, you saw an experimental result you were presented with that says, well at least to the extent that it could be measured, it was obviously getting very small.
再一次，你看到了一个,你经知道的实结果，至少在实验测量的范围内，对理想气体条件下的气体这一项很小。
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So we're just subtracting, in effect, zero, right, from the enthalpy of the product, but of course it's important have that established because the heat of formation is something you could measure, right?
所以从效果上说，我们只是，从生成物的焓中减去了零，但，是确立这一点很重要,因为生成热是,你能测量的东西，对吧？
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Well, I can, for any given case, measure the pressure, determine the entropy and I'll know what the slope of change will be.
好的，对特定的情况，我可以测量压强，确定熵,并且知道这就是变化的速率。
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Right, but what instruments will you need to measure it?
对,但你需要用什么仪器来测量呢
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pV So there is an arbitrary set point that needs to be defined, right? Because what you actually measure in the lab are changes in enthalpy, just like what you measure when you look at energy change of some sort, you measure the change in energy, right.
焓也是一样，焓是U加,所以需要定义一个任意的设定值,对吧？因为实际上你在实验室里,测得的是焓的改变,就像你在研究某种能量变化时，所测量的那样，你测量的是能量的改变，对吧。
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