First you need to gather up all of the materials you will need. Below is a list of the following items needed to conduct this experiment:
- A bowl of water
- A glass bottle with a small mouth opening
- A coin bigger than the mouth opening of the bottle
Are you ready? Let’s get started. First you will need to fill the bowl with cold water. Place the neck of the bottle and the coin in the water to get them nice and cold. You need to do this so that when you place the coin on top of the mouth of the bottle, it forms an airtight seal. Set the coin on top of the mouth of the bottle and then wrap your warm hands around the bottle. Wait for a few seconds and observe what’s happening. Then remove your hands and see what happens next.
What happened? Did the coin jump? It should have. Can you figure out why? When you wrap your hands around the bottle, the air inside the bottle heats up. The warm air inside the bottle pushes harder than the cool air outside the bottle which then causes the coin to jump. When the air inside the bottle cools, the coin will stop jumping. Cool, huh?