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  • Hi, I'm Eddie. I'm a formal communicator here in At Bristol

    嗨! 我叫Eddie。我在At Bristol(英國科學中心)擔任官方斡旋專員

  • In our water cycle workshop we talk about 'Supercooled Water'

    在今天的水循環工坊,我們要討論的是 「超冷卻水」

  • I've got a demo here for you that's great to try at home.

    我會做個示範,你也可以在家試試看

  • So, you may notice on those cold winter evenings people place salt

    在冬天晚上,你或許看過有人把鹽巴

  • out on the streets and pavements, because salty water can go well below zero degrees

    撒在街上或人行道,這樣做是因為鹽水在攝氏零下

  • and remain liquid it freezes.

    仍然不會結冰

  • We're going to try and get a bottle of fresh water to get well below zero degrees C

    我們也來試試看,讓一瓶水在攝氏零度以下

  • but still remain a liquid.

    仍然處在液體狀態

  • For your super cooled water demo

    超冷卻水的實驗

  • you need lots and lots of crushed ice,

    你需要很多很多的碎冰和

  • a small bottle of water

    一小瓶水

  • a beaker with round about 100ml of tapwater

    一個燒杯,裡面裝100毫升的自來水

  • plenty of table salt,

    大量的食鹽

  • teaspoon, and a metal cylinder to place all of your ingredients inside.

    茶匙、還有用來裝所有東西的鋼瓶

  • First thing I'm going to do is to pour plenty of crushed ice

    現在我要把大量的碎冰

  • into the bottom of my metal cylinder then

    倒進鋼瓶底部,然後

  • I need five teaspoons salt to sprinkle around

    再把五茶匙的鹽撒在上面

  • I'm going to now place my small water bottle inside

    現在我把這瓶水放進去

  • Around that water bottle now i need to pack in

    在這瓶水的周圍,盡可能地

  • as much ice as possible.

    把大量的碎冰塞進去

  • Now, another 5 spoons of salt

    現在,再放五茶匙的鹽巴

  • Next, i'm going to take 100ml of water

    再來,準備好100毫升的水

  • and add 5 teaspoons of salt to this

    把五茶匙的鹽巴加進去

  • Stir the mixture around

    攪一攪

  • Now i'm going to pour this salty water all around the ice

    現在我把鹽水倒進碎冰的周圍

  • around my bottle

    還有水瓶周圍

  • Now, if you've got any room

    如果空間還夠

  • add some more ice on top

    再放些碎冰在頂部

  • What we do now is just sit and wait for a good 30 minutes

    大約靜置個30分鐘

  • and then our supercooled water should be ready

    我們的超級冷卻水就完成了

  • The reason why i can get a bottle of fresh water below zero degrees without freezing

    這瓶純水在攝氏零下不會結冰的原因

  • is because in our bottled water,

    是因為瓶裝水裡面

  • we have nonucleation points. A nucleation point is simply

    沒有凝結核;凝結核就是

  • any impurities inside that bottle of water which is going to allow

    在瓶裝水裡頭的雜質

  • ice crystals to form around it. Now when I have my bottle of fresh water that is

    這些雜質會讓冰晶形成在周圍。當我把零度以下的純水

  • liquid but below zero degrees, if i cause a disturbance

    给它一些干擾因子

  • like pouring that water over an ice cube, I'm going to create many nucleation sites

    例如: 把它倒在冰塊上,那麼就會有需多的凝結核

  • and that liquid will turn to ice instantly.

    如此一來,零度以下的純水就會瞬間結冰

  • it's been about 30 minutes now, so let's see if our super cooled water

    30分鐘到了,讓我們用我們的超冷卻水

  • is ready to make some instant ice

    來做超急凍的冰塊

  • So there you go. Instant ice, fantastic experiment.

    你看到了嗎?急凍冰塊馬上就出來了,超完美的實驗

  • Why don't you try at home?

    在家你也來試試看!

Hi, I'm Eddie. I'm a formal communicator here in At Bristol

嗨! 我叫Eddie。我在At Bristol(英國科學中心)擔任官方斡旋專員

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天氣熱想喝冰?教你做出速凍冰塊! (How to make instant ice | Do Try This At Home! | At-Bristol Science Centre)

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    James 發佈於 2015 年 07 月 05 日
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