Can Crusher

We demonstrate the effects of imbalances of pressure. A metal can is crushed by atmospheric pressure. We add some water to a can and boil it until the can is full of water vapour. It is then sealed and left to cool and after a few minutes it collapses in on itself.

Physics - Forces - Learning Points.
Atmospheric pressure exerts large forces that are usually balanced.
When atmospheric pressure is not balanced, the forces can crush a metal container.

A Twig Experiment Film.
Let students experience real experiments in lab conditions anywhere, from setup, method all the way through to analysis and real-world application.