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B2 ScienceOct 19, 2026

Can atmospheric pressure boil water? A short experiment with Anu Ojha #science #demo #shorts

大気圧で水を沸騰させることはできる？アヌ・オジャによる短い実験 #science #demo #shorts

The Royal Institution15 videos Open on YouTube

Transcript

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Translation

What I've got here is I have got a kettle of very hot water, but it is not boiling.
ここにあるのは、非常に熱いお湯を入れたやかんですが、沸騰はしていません。
And we all know that down on the surface of the Earth, water boils at one hundred degrees centigrade.
ご存知の通り、地球の表面では水は摂氏100度で沸騰します。
What I've got here is just a glass syringe, as a demonstration syringe.
ここにあるのは、実演用のガラス製の注射器です。
And what I'm going to do is I'm going to extract some of that very hot water.
これから、その非常に熱いお湯を少し吸い上げます。
It's not boiling, and I'm going to leave a tiny air space above.
沸騰はしていません、そして上にわずかな空気の隙間を残します。
Now there is no way I can add heat energy to this system.
この系に熱エネルギーを加える方法はもうありません。
That water is probably at about sixty degrees centigrade at the moment, and it's not boiling.
その水は今おそらく摂氏60度くらいで、沸騰していません。
But if I seal the top, and if I pull down, you can start to see.
でも上を密封して、下に引っ張ると、見え始めます。
It's almost magic.
ほとんど魔法のようです。
I want to check what it's showing on the camera.
カメラにどう映っているか確認したいと思います。
You can see that this is now boiling away quite furiously because if I lower the pressure of a gas above a liquid, I'm reducing the boiling point.
このように激しく沸騰しているのが見えますが、これは液体の上の気体の圧力を下げると、沸点が下がるからです。
In fact, for any purists here, what you're actually seeing there is a combination of boiling and also gases coming out of solution.
実際、厳密に言うと、そこで見えているのは沸騰と、溶けていた気体が溶液から出てくる現象の組み合わせです。
And the moment I equalise the pressure, it stops.
そして圧力を均等に戻した瞬間に、それは止まります。

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