Alka-Seltzer Rocket

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Produced by the Institute of Physics, this Physics to Go video shows a demonstration of how the idea of pressure can be shown using just a 35mm film canister, some water and an effervescent tablet. When water is added to the effervescent tablet, bubbles of carbon dioxide gas are given off. When the lid is fitted tightly to the canister this gas is contained within an enclosed space. As more gas is given off the pressure inside the canister rises until there is enough force to overcome the seal of the lid. The built-up pressure exerts enough force to shoot the canister into the air. The teachers' notes include lists of the equipment needed, tips and a full explanation of the physics involved.

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