How to make a cool physics toy at home
This is a safe experiment. MEL Science recommends performing it with your children!
- a plastic water bottle;
- a wooden “diver” (you can also use match heads);
- a glass of water.
Put a wooden “diver” in a water bottle, fill to the brim with water, and close tightly. We strongly recommend using a screw cap bottle. Wait 15 minutes for the “diver” to be soaked through. Then squeeze the bottle and watch it embark on its dive.
You can demonstrate how water fills the pores using an inverted glass jar half-filled with water.
The diver is made of wood, which has a porous structure. These pores are filled with air. When the bottle is squeezed, the pressure inside of it increases. As the wood pores are compressed, the air is forced out of them and they are filled with water. The “diver’s” average density increases and it begins its journey downward!