We put a piece of paper in the bottom of a glass.
We turned the glass upside-down and put it into a tub of water.
The paper does not get wet! It is because there is still air inside the glass. The air in the glass pushed the water down, so no water went into the glass. The paper stays dry.
Next we filled the glass with water and pulled it up so we could see the water in the glass.
We blew air through a plastic tube into the glass. We saw bubbles of air in the water and the glass filled up with air. As the air filled the glass the water was pushed down.
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