• Student test on an a can being crushed

• Teacher notes and answers for this test

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Parent and Teacher Notes

This experiment explains air pressure to your child by demonstrating how air pressure alone can be strong enough to crush a can. It also shows the difference between high pressure and low pressure. When the boiling-hot can is placed into the cold water, there is low pressure inside and high pressure outside. The molecules inside the can are no longer hitting the can, but the air molecules outside continue hitting and crush the can.

Scientific concepts covered:

Air pressure: Air is all around us and pushes against everything it touches. This pushing force is called air pressure.

High air pressure: High air pressure is when a lot of air is packed into a closed space. As air molecules get hotter, they move faster and spread out more, creating a greater force.

Low air pressure: Low air pressure is when there is not a lot of air in a space. As air molecules cool down, they don’t move as much, and there is less force.

Water vapour: Water vapour is when water is in its gas form, for example, when water is boiled and evaporates.

Production Notes

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