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Show that air has pressure with the help...

Show that air has pressure with the help of an experiment.

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Otto von Guericke, a German Scientist invented a pump in 17th century to extract air out of a vessel. He demonstrated the force of the air pressure. He joined two hollow metallic hemispheres of 51 cm diameter each, and pumped air out of them. Then he employed eight horses on each hemisphere to pull apart. So greater is the force of air pressure that the hemisphere could not be pulled apart.

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