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Suction cup holds onto to surfaces | Atmospheric Pressure | Physics

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The principle behind suction cups is explained in this video. Suction is a phenomenon that happens because of atmospheric pressure. If a little air is removed or evacuated from a small enclosed space, that space experiences lower pressure. Because of the lower pressure in a small area, the atmospheric pressure outside pushes down on it and holds it firmly in place. Suction cups will hold on until either the cup is lifted from the side allowing air in and makes pressures equal or by applying a force large enough to overcome atmospheric pressure.
Tags
atmospheric science, how the atmosphere works

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