We encounter air pressure. Similar effects bring us closer to the phenomenon.
amazingly, let yourself do not move the paper ball into the bottle and do not blow up the balloon in the bottle (without drinking straw).
If we blow into the bottle neck, the air pressure in the bottle increases. The paper ball is therefore pushed out when blowing in!
Quite the same with the balloon experiment: the enlarged balloon closes the bottle from the inside. Because the air cannot come out of the bottle, no air can enter the balloon!
The children have learned that where nothing can come out, nothing can go in!
- Two empty clear bottles
- drinking straw
Material for the supervisor:
We encounter air pressure:
1. Place a paper ball in the bottle neck and try to blow it into it.
2. Try to blow up a balloon in the bottle. In the first attempt it doesn’t work. Is it possible if there is a drinking straw in the bottle neck? Why is that?
3. We put a funnel on the bottle and fill with water. Then we repeat the experiment, but first seal the connection between the bottle neck and funnel dough from. Does anything change? Measure the times!
Result: Amazingly, the paper ball cannot be moved into the bottle and the balloon in the bottle cannot be inflated (without a drinking straw). If we blow into the bottle neck, the air pressure in the bottle increases. The paper ball is therefore pushed out when blowing in!
Quite the same with the balloon experiment: the enlarged balloon closes the bottle from the inside. Because the air cannot come out of the bottle, no air can enter the balloon! The air pressure in the bottle is too strong. The drinking straw is the solution. He provides for pressure equalization. This effect can be measured well with the funnel experiment: Different times are required for the same amount of water (500 ml), since the seal always has to compensate for pressure.
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