We did some interesting science that we can easily practise in the bath at home. We got a bottle and filled it with water, put a hand on top, turned the bottle over and took the hand away. We had to guess what would happen.
It was as we thought - the water that was in the bottle rushed out once the hand was taken away. The second time we tried this, we only took our hand away when the bottle was under water. This time the water stayed in the bottle.
This is because the water in the bottle wanted to get out, while the water in the basin wanted to get in, so the water ended up going nowhere and stayed in the bottle.
Next we got a yoghurt pot and a square of cardboard. We filled the pot with water, put the card on top, turned the pot and card upside down and took our hand away. 
Surprise, surprise, the card stayed on the bottom of the pot without falling off. This is because the air on the bottom of the card is pushing the card up into the pot, and the water is trying to get out, so both end up going nowhere at all.
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