Paper for Kids Published Twice a Month
Fun Science

Jumping Coin
Material Required:
Glass soda bottle with small mouth opening, A coin that is larger than bottle opening

Instructions:
1. Put the bottle in the fridge for 10 minutes so that the air becomes cold.
2. The top of the bottle should be wet, when put out of the fridge.
3. Put the coin on the bottle.
4. Wrap your hands around the bottle and wait for several seconds so that it heats up. The coin starts to jump.

Wondering How?
When you hold the bottle with your hands, the air inside the bottle heats up. The warm air pushes harder than the cool air that is outside the bottle so it forces the coin up.