The Imploding Can

Aim

To observe contraction in gases.

Equipment

Aluminium can
Scissor Tongs
Bunsen burner
Heatproof mat
Tripod
Gauze mat
An open container of water

Method

1. Set up Bunsen burner underneath a tripod and gauze mat.
2. Pour approximately 50-60mL of water into your can. It should be no more than 1/4 full
3. Heat the can of water until steam is seen escaping from the top
4. Carefully grip the can with the scissor tongs. Ensure you have a firm hold of the can before lifting it off the gauze mat
5. Quickly, but very carefully, invert the can as you plunge it into a container of water.

Results:

When we plopped the can into the cold water it crumpled up... That's why it's called the imploding can... experiment...

Discussion: 

This happens because when the particles heat up they move around inside the can. When the can hits the water, the particles cool down so quickly they pull the can in, crumpling it.