Name: 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)
Uploaded: 2025-07-08T21:01:30.000Z
Duration: 3 min 20 s

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

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

a beaker with round about 100ml of tapwater

一個燒杯，裡面裝100毫升的自來水

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

into the bottom of my metal cylinder then

I need five teaspoons salt to sprinkle around

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

Around that water bottle now i need to pack in

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

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

and then our supercooled water should be ready

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

we have nonucleation points. A nucleation point is simply

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

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

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

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