Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity. The effect can be seen in the drawing up of liquids between the hairs of a paint-brush, in a thin tube, in porous materials such as paper, in some non-porous materials such as liquified carbon fiber, or in a cell. It occurs because of inter-molecular attractive forces between the liquid and solid surrounding surfaces. If the diameter of the tube is sufficiently small, then the combination of surface tension (which is caused by cohesion within the liquid) and adhesive forces between the liquid and container act to lift the liquid.

Contents

• 1 Phenomena and physics of capillary action
• 2 Examples
• 3 Height of a meniscus
• 4 Liquid transport in porous media
• 5 Miscellaneous
• 6 See also
• 7 References

Noun

capillary action (uncountable)

1. The ability of a narrow interstice to draw a liquid due to surface tension upwards against the force of gravity.
2. The siphoning of liquid into a joint or void between two adjacent surfaces.

See also

• wick

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