Cloud in a Bottle

Produced by the Institute of Physics, this Physics to Go video shows a short demonstration that can be used to engage your students. The teacher notes include the equipment needed, tips and contain a full explanation of the physics involved.

This simple demonstration can be used to show water condensation as a 'cloud' forms inside a plastic bottle. Clouds are formed when water droplets in the air cool and then collect on dust particles. In this demonstration, the dust particles are provided by smoke from a match. Cool the air in the bottle and the cloud will form.

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• URL: http://stem.org.uk/rx6vx