Placeholder Image

Subtitles section Play video

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

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

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

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

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

  • and remain liquid it freezes.

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

  • but still remain a liquid.

  • For your super cooled water demo

  • you need lots and lots of crushed ice,

  • a small bottle of water

  • a beaker with round about 100ml of tapwater

  • plenty of table salt,

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

  • 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

  • as much ice as possible.

  • Now, another 5 spoons of salt

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

  • and add 5 teaspoons of salt to this

  • Stir the mixture around

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

  • around my bottle

  • Now, if you've got any room

  • add some more ice on top

  • 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

  • is because in our bottled water,

  • 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

  • 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

  • and that liquid will turn to ice instantly.

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

  • is ready to make some instant ice

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

  • Why don't you try at home?

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

Subtitles and vocabulary

Operation of videos Adjust the video here to display the subtitles

B1 UK water salt fresh water liquid instant bristol

How to make instant ice | Do Try This At Home! | At-Bristol Science Centre

  • 7524 468
    James posted on 2015/07/05
Video vocabulary