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Capillaries

How does capillary action work?

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September 03, 2011 7:06PM

Capillary action occurs when a liquid, such as water, is in a narrow vessel. Adhesion of water molecules to the walls of the vessel causes an upward force on the liquid at the edges and results in these molecules moving up the walls. The surface tension, which acts much like a skin across the water's surface, holds the water molecules together. So instead of just the edges of the water moving upward, the whole liquid surface is dragged upward, creating a curved surface. thats how we do it WV.