初級 31048 タグ追加 保存
動画の字幕をクリックしてすぐ単語の意味を調べられます!
単語帳読み込み中…
字幕の修正報告
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?
コツ:単語をクリックしてすぐ意味を調べられます!

読み込み中…

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

31048 タグ追加 保存
James 2015 年 7 月 6 日 に公開
お勧め動画
  1. 1. クリック一つで単語を検索

    右側のスプリクトの単語をクリックするだけで即座に意味が検索できます。

  2. 2. リピート機能

    クリックするだけで同じフレーズを何回もリピート可能!

  3. 3. ショートカット

    キーボードショートカットを使うことによって勉強の効率を上げることが出来ます。

  4. 4. 字幕の表示/非表示

    日・英のボタンをクリックすることで自由に字幕のオンオフを切り替えられます。

  5. 5. 動画をブログ等でシェア

    コードを貼り付けてVoiceTubeの動画再生プレーヤーをブログ等でシェアすることが出来ます!

  6. 6. 全画面再生

    左側の矢印をクリックすることで全画面で再生できるようになります。

  1. クイズ付き動画

    リスニングクイズに挑戦!

  1. クリックしてメモを表示

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔