为什么高杯子里的水会沸腾
字幕摘录
| 时间 | 英文 | 中文 |
|---|---|---|
| 0:00 | Hey everyone, I'm at the top of a parking structure to see if it's possible to boil water just by lifting it up a little bit in the air. | 嘿,大家好,我在停车结构的顶端 看能不能在空气中举起水来煮沸水 |
| 0:06 | So we've all seen the trick or even done the trick where if you have a cup of water submerged under the water and then lift it up above the surface, the water actually stays inside the cup. | 所以我们都看到了这个把戏 或者甚至做了这个把戏 如果你有杯水淹没在水下 然后把它抬到水面上 水实际上留在水杯里 |
| 0:16 | The reason this happens is because the water can't fall out of the cup because it needs something to replace that volume of water with and there's no inlet of air so the water can't fall out. | 之所以发生这种情况,是因为水不能从杯子里掉下来,因为它需要一些东西来取代水的体积,并且没有空气的入口,所以水不能掉出来. |
| 0:25 | So basically the air pressure of the water around it is keeping the water up inside the cup. | 基本上,周围的水的气压 是保持水在杯内。 |
| 0:31 | So let's look at the pressures inside this experiment. | 让我们看看实验中的压力。 |
| 0:33 | You can see that the pressure outside of the cup must be atmospheric pressure. | 你可以看到杯外的压力必须是大气压力. |
| 0:37 | So inside of the cup at the level of the surface of water outside the cup, you know that that point is atmospheric pressure. | 所以在杯外水面的杯内, 你知道那个点是大气压力。 |
| 0:44 | If you go down, it's going to increase in pressure, but that means that if you go up, it's going to decrease in pressure. | 如果下降,压力会增加,但这意味着如果上升,压力会降低. |
| 0:50 | So that means the higher you go inside the cup, the lower pressure it is. | 所以这意味着你进入杯子里越高,压力就越低。 |
| 0:54 | So by turning the cup upside down and lifting it above water, you've created a little bit of a vacuum in there. | 因此,通过把杯子颠倒并提升到水面上,你在那里创造了一点真空. |
展开字幕全文（59 条）
| 序号 | 英文 | 中文 |
|---|---|---|
| 1 | Hey everyone, I'm at the top of a parking structure to see if it's possible to boil water just by lifting it up a little bit in the air. | 嘿,大家好,我在停车结构的顶端 看能不能在空气中举起水来煮沸水 |
| 2 | So we've all seen the trick or even done the trick where if you have a cup of water submerged under the water and then lift it up above the surface, the water actually stays inside the cup. | 所以我们都看到了这个把戏 或者甚至做了这个把戏 如果你有杯水淹没在水下 然后把它抬到水面上 水实际上留在水杯里 |
| 3 | The reason this happens is because the water can't fall out of the cup because it needs something to replace that volume of water with and there's no inlet of air so the water can't fall out. | 之所以发生这种情况,是因为水不能从杯子里掉下来,因为它需要一些东西来取代水的体积,并且没有空气的入口,所以水不能掉出来. |
| 4 | So basically the air pressure of the water around it is keeping the water up inside the cup. | 基本上,周围的水的气压 是保持水在杯内。 |
| 5 | So let's look at the pressures inside this experiment. | 让我们看看实验中的压力。 |
| 6 | You can see that the pressure outside of the cup must be atmospheric pressure. | 你可以看到杯外的压力必须是大气压力. |
| 7 | So inside of the cup at the level of the surface of water outside the cup, you know that that point is atmospheric pressure. | 所以在杯外水面的杯内, 你知道那个点是大气压力。 |
| 8 | If you go down, it's going to increase in pressure, but that means that if you go up, it's going to decrease in pressure. | 如果下降,压力会增加,但这意味着如果上升,压力会降低. |
| 9 | So that means the higher you go inside the cup, the lower pressure it is. | 所以这意味着你进入杯子里越高,压力就越低。 |
| 10 | So by turning the cup upside down and lifting it above water, you've created a little bit of a vacuum in there. | 因此,通过把杯子颠倒并提升到水面上,你在那里创造了一点真空. |
| 11 | And that vacuum is what's holding the water up in there as if you had sucked it up. | 真空就是把水拉上去 就像你吸了一样 |
| 12 | And the taller your cup is, the higher that water can get in there. | 你的杯子越高,水就越能进水。 |
| 13 | But the question is, is there a theoretical limit to how tall your cup could get? | 但问题是 你的杯子能有多高有理论限制吗? |
| 14 | Instead of a cup, I'm just going to use a tube, but it's the same thing as a cup. | 而不是杯子,我只是要用管子,但和杯子一样. |
| 15 | It's just flexible and easier to maneuver. | 它只是灵活和容易操作。 |
| 16 | So I'm going to fill the tube completely with water and then plug up one end of it. | 所以我要把管子装满水 然后插上一端 |
| 17 | So one end is going to be submerged and the other end is plugged up. | 因此一端将被淹没,另一端被堵塞. |
| 18 | So it's completely filled with water. | 故其水完全充满. |
| 19 | And then I'm just going to lift it up. | 后随举起. |
| 20 | And as I lift it up, that's basically lengthening my cup. | 当我把它抬起来时, 基本上就是在延长我的杯子。 |
| 21 | So let's see how high we can actually lift this water up above the surface and see what happens. | 所以让我们看看我们到底能把水 提升到水面上, 看看会发生什么。 |
| 22 | OK, now I'm going to clamp it shut right here. | 好了,现在我要把它堵住 |
| 23 | OK, so I'm going to start it here and then I'll hook it on here, attach it and then walk up to the next level. | 好了,我先从这里开始,然后我把它绑在这里, 把它绑起来,然后走到下一个高度。 |
| 24 | So each time I attach it, that's an extra five feet. | 所以每次我把它附着, 那是额外的5英尺。 |
| 25 | OK, up the next level. | 好吧,上一层楼。 |
| 26 | Still don't see any boiling. | 仍然看不到任何沸腾。 |
| 27 | Up to the next level. | 上至下关. |
| 28 | Still don't see any boiling. | 仍然看不到任何沸腾。 |
| 29 | OK, so watch me lift it up here. | 好,看我把它举起来 |
| 30 | Oh, look at all that boiling. | 哦,看看所有的沸腾。 |
| 31 | I just hit the boiling point here. | 我刚到了沸点 |
| 32 | So this is as high as it goes. | 因此,这是像它去。 |
| 33 | If I lift it higher, it's going to boil and it goes back down to that same spot. | 如果我把它抬高, 它会沸腾, 它会回到同一个地方。 |
| 34 | So you can see at the top here, there's a limit to how high the water can get. | 所以这里的顶部可以看到水的高度是有限的. |
| 35 | If we get any higher, it just boils more water and just puts water vapor at the top. | 如果我们得到更高的, 它只是煮更多的水 并只是把水蒸汽 在顶端。 |
| 36 | Move it down and the level stays right there. | 移动下来,关卡就在那里。 |
| 37 | OK, so now watch me pick it up. | 好,现在看我捡起来 |
| 38 | This is actually really interesting. | 这真的很有趣。 |
| 39 | In the same spot, I did a different experiment where I saw how high you could suck up water through a tube. | 在同一地点,我做了一个不同的实验 在那里,我看到了你有多高 可以吸水通过管。 |
| 40 | And it's actually basically the same experiment. | 并且它实际上是 基本上相同的实验。 |
| 41 | But instead of using a vacuum chamber or my mouth to try to suck up water, | 而不是用真空室或我的嘴来吸水 |
| 42 | all I did was plug it up and then lift it up above the level of water. | 我所做的只是把它插上 然后把它抬到水面上 |
| 43 | So this is basically just a different way to make a vacuum inside the tube. | 所以,这基本上只是一个不同的方法 制造一个真空在管子内部。 |
| 44 | Just plug it and then lift it high above the surface. | 只要插上,然后把它抬高到表面。 |
| 45 | The reason it's making that vacuum in there is because the whole weight of the water is pulling down on it. | 造成真空的原因是 整个水的重量在拉下来 |
| 46 | So it's pulling down on it, trying to create some space in there. | 因此它正在拉下来,试图在那里创造一些空间。 |
| 47 | But because there's no inlet in there, there's no space to make. | 但是因为里面没有入口,所以没有空间可以制造. |
| 48 | So the pressure just drops lower and lower and lower until eventually it reaches the boiling point of water | 因此,压力只是下降 下和下,直到最终达到水的沸点 |
| 49 | at whatever temperature that water is in the tube. | 无论水在什么温度下都行 |
| 50 | So the warmer the water, the less high you're going to be able to lift it above the surface of water before you boil it. | 水越暖,水越低,你就能在煮沸之前将其提升到水面之上. |
| 51 | The colder your water, the higher you're going to be able to lift it. | 水越冷,升得越高. |
| 52 | The theoretical limit to how high we could get is 33.8 feet. | 理论上,我们可以达到的高度是33.8英尺。 |
| 53 | That's as if there was a perfect vacuum inside that tube there. | 就像那个管子里面有完美的真空 |
| 54 | And thanks for watching another episode of the Action Lab. | 感谢您观看另一集的动作实验室。 |
| 55 | I hope you liked it. | 希望你喜欢 |
| 56 | If you did, don't forget to subscribe if you haven't yet and hit the bell so you can be notified when I release my latest video. | 如果你有,不要忘了订阅 如果你还没有,并击钟 这样你就可以通知 当我发布我的最新视频。 |
| 57 | And check out Action Lab Shorts, which is my second channel I have where I do videos similar to this one, | 看看动作实验室的短片 这是我第二个频道 我在那里拍的视频和这个类似 |
| 58 | but I make them in less than a minute. | 但我在不到一分钟内就做了 |
| 59 | And thanks for watching and I'll see you next time. | 谢谢你的观看 下次见 |
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