Explain how a suction cup sticks to a smooth surface, relating it to atmospheric pressure.

8 views 2 helpful Updated Jul 27, 2026
Appears in Class 8th
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Answer

When a suction cup is pressed against a smooth surface, the air between the cup and the surface is forced out, creating a region of lower pressure inside the cup. The higher atmospheric pressure outside the cup then pushes the cup firmly against the surface, holding it in place.

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