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Capillary action, capillarity, capillary motion, or wicking is the ability of a substance to draw another substance into it. The standard reference of capillary action is to a tube in plants, but it can be seen readily with porous paper. It occurs when the adhesive intermolecular forces between the liquid and a substance are stronger than the cohesive intermolecular forces inside the liquid. The effect causes a concave meniscus to form where the substance is touching a vertical surface. The same effect is what causes porous materials such as sponges to soak up liquids. A flow of carrier gas in a silica capillary column of a GC system. This flow can be calculated by Poiseuille's equation for compressible fluids. Capillary Action=? NAB
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