Cloud In A Bottle
Compression can do funny things to gasses. When gasses are compressed, they get hotter. Once the gas is able to expand, it will become cooler.
Gasses that are hotter will cause more water to evaporate into water vapor. When the pressure is released, the gas can expand very quickly which causes it to cool. The water vapor will then condensate back into water in a liquid form.
This process allows you to physically see how this heating and cooling creates real clouds.
1. Would this experiment work if there was a way to externally heat the bottle?
2. Does the amount of water matter?
3. What would happen if an ice cube was used in place of water?