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Why do suction cup stick to wet surfaces better than dry surfaces?
Wiki User
∙ 14y ago
No. How well a suction cup sticks to a surface has to do with how will a seal can be formed on the surface. Rough surfaces will not form good seals compared to smooth surfaces which means that suction cups will not stick as well to rough surfaces as they do to smooth surfaces.
Wiki User
∙ 8y ago
Wiki User
∙ 14y agoThe liquid wetting the surface forms a seal that holds atmospheric pressure outside the suction cup. With a dry surface, air can leak through scratches and roughness at the interface between the cup and the surface causing the pressure inside the cup to rise to that of the surrounding air. Once the pressure inside the cup equals the atmospheric pressure outside, there is no longer a suction force to hold the cup in place.
Wiki User
∙ 15y agoSuction cups stick best to wet surfaces.
Wiki User
∙ 15y agoyes
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