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它把压强、体积、温度联系在一起。
It relates the pressure, volume, and temperature together.
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这个参考压强，我们一般选作一巴。
And this reference pressure, we took as one bar.
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所以在初始压强，我们只有液体。
So at our initial pressure, we just have all liquid.
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当然，我们可以继续降低压强。
Of course, we can continue to lower the pressure.
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如果改变压强，那么就会有问题。
If you change the pressure, then you're in trouble.
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我们知道压强等于力除以面积。
We know the pressure is equal to force per area.
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因为里外不处于同样的压强下。
Because these aren't at the same pressure.
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但是这个分压是总压强的函数。
But it's a function of the total pressure.
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在同样的压强和温度条件下。
The same conditions of pressure and temperature.
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它是一个外部施加的压强。
So there's an external pressure.
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所以这就是我们的总压强。
So there's our total pressure here.
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你最终会有更大的压强。
You end up with a larger pressure.
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现在这里有附加的压强。
Where now there is additional pressure here.
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这是总压强出现的地方。
And this is where the total pressure comes in.
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那是对于在这样的,温度和压强下的纯液体。
So that's for the pure liquid at that temperature and pressure.
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当然，压强是不同的。
Of course, the pressure is different.
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这一项代表外部压强。
So there's our external pressure.
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压强，低的压强下我只有纯气体。
Pressure, low pressure, I have pure gas.
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让我们继续降低压强。
Let's lower the pressure some more.
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等压“指压强不变。”
Whereas, like isobaric means constant pressure.
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现在慢慢的减小压强。
And I'm going to slowly decrease the pressure.
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特别是，压强会改变。
In particular, the pressure will have changed.
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在这里，增加压强，压强上升。
And I increase the pressure, pressure goes up.
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因此把压强带入到这里，算出积分。
So we can put that in here and do this integral.
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比如压强和温度，或体积和压强。
For instance, the pressure and the temperature, or the volume and the pressure.
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当我保持压强恒定。
If I keep the pressure constant.
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压强放在另外一边。
Put the pressures on the other side.
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就像参考压强那样。
It's just like the reference pressure.
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我们继续降低压强。
Well, we could keep lowering the pressure.
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压强或许开始上升。
And the pressure might start to go up.
youdao