Suction cup

A suction cup, also known as a sucker, is a device or object that uses the negative fluid pressure of air or water to adhere to nonporous surfaces, creating a partial vacuum.[1]

A transparent suction cup
The pressure on a suction cup as exerted by collisions of gas molecules holds the suction cup in contact with the surface.
One cup suction lifter.

Suction cups are peripheral traits of some animals such as octopuses and squids, and have been reproduced artificially for numerous purposes.[2]


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