活塞在蒸汽压力下运动。
在27摄氏度时，蒸汽压为25。
盐水的蒸汽压，比纯水的蒸汽压小。
A salt in water solution will have a lower vapor pressure than a solution of pure water.
现在我想问的是，水的蒸汽压是多少？
Then I want to ask the question, what is the vapor pressure of the water?
可以预计蒸汽压会下降。
我们知道这里有蒸汽压？
但是水的蒸汽压很小。
过热的水箱会逐步形成蒸汽压位差。
你需要找出蒸汽压。
意味着亨利定律常数，比纯cs2的蒸汽压大。
Meaning that the Henry's law constant is greater than the vapor pressure of the pure CS2.
溶质的蒸汽压，和溶液中溶质的摩尔分数成正比。
That the vapor pressure of the solute is related to the mole fraction in the solution.
很显然肯定,会有蒸汽压存在，即使是在室温下。
Obviously there's going to be a little bit of vapor pressure, even at room temperature.
当存在糖的情况下，水的蒸汽压会下降。
The pressure, the vapor pressure, of the water is going to be lower when the sugar is there.
蒸汽压力或给水压力下降。
蒸汽压缩之后反应堆系统的压力就会降低。
The steam then condenses and reduces pressure in the reactor system.
蒸汽压的下降。
我先考虑总压强，等于水的蒸汽压的情况。
I'm going to have the total pressure is going to be the partial pressure of the water.
这台蒸汽机的蒸汽压力是由这个按钮控制的。
The pressure of steam in the engine is controlled by this button.
在实验中你可以测量蒸汽压，作为温度的函数。
Where you measure the pressure, the vapor pressure, as a function of temperature.
这很正常，水的蒸汽压非常接近通常的蒸汽压。
It's the usual, it's pretty close to the usual vapor pressure.
蒸汽压路机把砾石路基压平后浇灌了混凝土。
The steam-roller levelled out the gravel roadbed and then the concrete was poured.
在室温下，结果是RDX根本不挥发，所以蒸汽压很小。
And room temperature, it turns out if it's not volatile at all, if the vapor pressure is very, really tiny.
我们得到一个比拉·乌尔定律，预期更高的蒸汽压。
You get a higher pressure than you expect from Raoult's law.
我们来画相图，蒸汽压下降，意味着凝固点降低，和沸点降低。
And we also drew a phase diagram to show how this vapor pressure lowering was going to imply freezing point depression and boiling point depression.
结果CS2的蒸汽压与，拉乌尔定律有一个正的偏离。
换句话说，液体A上的蒸汽压，比液体B上的蒸汽压大。
In other words, the vapor pressure over pure liquid a is higher than the vapor pressure over pure liquid B.
我们可以从蒸汽压得变化，而不是渗透压，得到这个结果。
It's going to come from the vapor pressure lowering not from the osmotic pressure, which we'll do next.
这个常数是纯物质的蒸汽压，乘以液相的组分，Raoult定律。
Which is the vapor pressure of the pure material times the, and the composition of the liquid phase, Raoult's law.
他含笑的站在一个酒吧前，那儿有一个闪光的蒸汽压咖啡机。
He smiled and stood before a bar with a shining steam pressure coffee machine.
他含笑的站在一个酒吧前，那儿有一个闪光的蒸汽压咖啡机。
He smiled and stood before a bar with a shining steam pressure coffee machine.
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