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¼ö¾Æ,Çö¿õ, If I put this cup with paper in it into this bowl of water. What will happen?
Before we start an experiment. I have something to tell you.
Air is all around us. this is the point
Let¡¯s stuff a paper into the bottom of a cup and overturn it
Then Push the cup under the water in a bowl
Keep the cup upside down Don¡¯t tip it.
Lift the cup out of the water and take out the paper. What happened?
Is it wet? Or dry?.
The paper was under the water. but it did not get wet.
Do you know why??
Yes. Air!! That¡¯s the right answer.
I know that it is hard to believe because you can't see the air, or feel it either,
But air is all around you. Of course, cups are full of it. Just before you saw it.
The air inside a cup protect the paper dry.
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oh .it is wet. Do you know why? if you tip the glass a little bit. you can make the water go in.ccan you see this bubble? A bubble of air goes out and up.
When the air goes out, Water goes in.because there is empty space in the glass.
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