capillary action


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capillary action

n.
The interaction between contacting surfaces of a liquid and a solid that distorts the liquid surface from a planar shape and causes the liquid to rise or fall in a narrow tube.

capillary action

The movement of a liquid along the surface of a solid caused by the greater attraction of the liquid's molecules to the surface of the solid than to each other. The liquid's molecules adhere to the solid surface and also to each other, so that each molecule pulls the next one along. Water moves through the roots of trees or into the pores of a sponge or towel by capillary action.
Did You Know? The paper towel industry owes its existence to capillary action. Towels easily draw up water, much as a drop of blood to be taken for a test will defy gravity and travel up a small tube. In both cases, the force of gravity is still in effect, but it is being overwhelmed by the stickiness of liquids. The molecules of liquid stick to the sides of a narrow tube or the tiny channels in a towel, and other molecules stick to the first molecules, so the liquid crawls upwards. Some people think that this capillary action is responsible for moving water from the roots to the highest leaves of a tree, but it can only push water up so high. The remaining trip is powered by transpiration pull. As water evaporates from leaves, it sets up a suction that turns the entire tree into a straw through which the water on the bottom is pulled up.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.capillary action - a phenomenon associated with surface tension and resulting in the elevation or depression of liquids in capillariescapillary action - a phenomenon associated with surface tension and resulting in the elevation or depression of liquids in capillaries
surface tension - a phenomenon at the surface of a liquid caused by intermolecular forces
References in periodicals archive ?
The paper's capillary action made the two liquids to flow and mix.
The PCB is then heated so that the underfill is absorbed underneath key components via capillary action.
At its melting point, braze alloy melts and distributes itself between the work pieces due to the capillary action. Braze alloys can be utilized in a number of forms such as paste, powder, tapes, foils and braze wires, and rods.
It then travels back along the tube, condensing and dissipating heat along the pipe, before returning to the LEDs by capillary action. Owing to this framework, the company claims that the Lightcycle's LEDs can last up to a whopping 60 years.
Jurin's law of capillary action describes an inverse relationship between the height of capillary action of the fluid within a narrow tube and the tube diameter.
"Vacuum brazing uses a braze metal with a lower melt point that flows by capillary action into the space between the parts.
Once a path is formed, an aqueous layer, which enables the electrochemical reactions to take place, can develop through the adsorption, absorption and capillary action of moisture at the resin/ fiber interface.
The activities will range from culinary events to DIY and laboratory classes, all of which are designed to help students get a better understanding of science that takes place in everyday life, such as gravity, electric current, and capillary action, among many others.
APTMA has also proposed to impose a 15 per cent regulatory duty on the import of synthetic yarns entering into the domestic commerce of Pakistan, separate HS code for speciality polyester staple fibres like moisture absorbent, cat ionic dyed polyesters, capillary action, hygenic fibres as they are presently clubbed together with normal domestically produced PSF.
For foundations, a damp proof membrane is put in between the ground floor masonry stone and the floor slab to prevent moisture from being sucked upwards through capillary action. A plastic PVC 500 gauge membrane is also placed on top of the hardcore before laying of the slab to ensure no moisture is sucked from below onto the ground floor slab," says Mr Gichuhi.
This reduces the stiffness of the yarn leading to additional softness, creates a smoother yarn surface which delivers a luxurious fine and dry touch and due to the increased fibre surface area, improves the capillary action and the moisture wicking effect.
In the case of surface impregnation, liquid silane penetrates into the pore space of concrete by capillary action. In order to achieve a sufficient penetration depth, the contact time between the concrete surface and the liquid silane must be long enough [21-23].