What are Suction Cups?
A suction cup is a device that is generally made out of a plastic or rubber product and has the shape of half of a sphere. Suction cups are generally not used on their own, but are employed as attaching devices. Because of their malleable nature, they can adhere to smooth surfaces. The surfaces must be nonporous in addition to being smooth. Suction cups can adhere to such surfaces as glass and metal. They generally cannot adhere to brick or wood unless those substances have been sanded flat and coated. As per their name, suction cups create adherence through suction. When they are applied to a surface and pressed, they expel some of their air underneath the cup. When the pressure is alleviated, air cannot reenter the cup as long as it is has been applied to a flat surface. A higher atmospheric pressure then exists underneath the cup, holding it in place. If the suction cup is made out of good materials and is well-designed, it can remain in place for quite some time. Furthermore, it is
