capillary action


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capillary action

the process involving molecular adhesion by which the surface of a liquid in a tube is either elevated or depressed, depending on the cohesiveness of the liquid molecules. The more cohesive the molecules, the more depressed will be the surface of the liquid. Less cohesive liquid molecules will adhere to the surfaces of the tube in which they are contained and elevate the surface of the liquid. Also called capillary attraction, capillarity.

capillary action

The spontaneous movement of a liquid up thin tubes, due to adhesive and cohesive forces and surface tension.

capillary action

A surface tension effect shown by the elevation or depression of a liquid at the region of contact with a solid, as in capillary tubes.
Synonym: capillarity
See also: action
References in periodicals archive ?
Micro- capillary usually comes with graduation marks for every microlitre that assist the observation of capillary action up to a certain volume.
The filler metal is distributed between the closely fitted faying surfaces of the joint by capillary action.
A two parallel plates illustrating two surfaces separated by distance within which fluid flow due to capillary action is presented and 0.
The felt is soaked by capillary action with this nutrient solution, which flows down the wall by gravity.
BRAZING, a metal-joining process whereby a filler metal is heated above and distributed between two or more close-fitting parts by capillary action, has now been made safe and efficient with mixed oxyhydrogen gas generators.
In such situations, MVT tends to make its way upward through the slab via capillary action, eventually condensing into a high pH liquid that builds up, destroying the ability of the industrial flooring to bond to the substrate.
It stimulates the capillary action and prevention of evaporation of groundwater, steadies the temperature around the roots, fights competitive weeds near the planted tree, as well as prevents the damage by rodents.
Wooden plinths on which stacks of wheat bags are piled get saturated with water and the excess moisture by capillary action moves up to the food grains, making them highly vulnerable to attack by insects, pests and rodents.
A couple of oil cups, with a thimble-full in each, fed oil via capillary action through a wick to some bearings.
This is a layer 150 to 200 millimetres deep, comprising granular material, Ras Al Khaima gravel, for example, used to stop the upward movement of salts through capillary action.
Because most virgin polymer surfaces are hydrophobic, the surface must be modified to promote wetting, capillary action and proper fluidic motion.