About capillary principle

Capillary action: The rise, penetration, or descent of a fluid along the pores of a body in contact with it. Capillarity occurs when the adhesion between the liquid and the solid (the wall of the tube) is greater than the cohesive force of the liquid itself. Liquid in vertical thin tube when the liquid surface concave or convex, and porous material objects can absorb liquid are caused by this phenomenon.

The most common example of capillarity is that water absorbed by the roots of plants can rise through the vascular bundles within the stem.

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