A Torricellian chamber is a scientific apparatus used to demonstrate the principles of atmospheric pressure and vacuum. It is named after the Italian scientist Evangelista Torricelli, who is best known for his work in hydrostatics and the invention of the barometer. The chamber typically consists of a sealed container that has a liquid (usually mercury) inside. When the container is inverted, the liquid does not fall completely out due to atmospheric pressure acting on the liquid's surface outside the chamber.
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