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"Does Air Take Up Space?" Water and Air PPT Courseware 4
When you blow up a balloon, what makes the balloon get bigger?
If you press the balloon, what will its shape be like?
Press the balloon and the shape of the balloon will change.
At the same time, your hand will feel the rebound force of the balloon; after you let go, the balloon will return to its original shape.
help
There is some water in the bottle. Can you use the knowledge you learned today (air) to squeeze the water out of the bottle without tilting the bottle?
Experimental materials: plasticine, straws, bottles
Let’s discuss it first
Think about it: ①What is the use of plasticine? ②How do you get air into the bottle? ③How do you use air to squeeze water?
Can paper get wet?
1. Do not make loud noises during the experiment, and pay attention to division of labor and cooperation among group members.
2. If it succeeds the first time, think about whether there are other methods; if it fails, improve it and try again.
3. When placing paper at the bottom of the cup, make sure it is tightly packed and cannot let it fall.
4. The cup should be turned upside down and immersed in water, and should not be tilted.
5. Take the cup upright from the water, wipe the mouth of the cup and check whether the paper is wet.
Syringe push and pull experiment
Experimental requirements:
1. Gently push and pull the piston with your fingers and carefully observe the experimental phenomenon.
2. Comparison: What is the difference between the two?
3. Complete the form.
DIY
1. Prepare two syringes and fill them with the same volume (10ml) of water and air respectively.
2. Plug the nozzle, push the piston with the same force, and record the positions of the two syringe pistons.
3. Plug the nozzle, pull the piston with the same force, and record the positions of the two syringe pistons.
The essential:
Same volume of water and air
The same force pushes or pulls the piston
Observe carefully, record carefully, and cooperate in unity
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