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Encyclopedia > Suction

Suction is the creation of a partial vacuum, or region of low pressure. The pressure gradient between this region and the ambient pressure will propel matter toward the low pressure area. Physicists consider the notion of "suction" to be specious, since vacuums do not innately attract matter. Look up Vacuum in Wiktionary, the free dictionary. ... The pressure gradient force is the force that is usually responsible for accelerating a parcel of air from a high atmospheric pressure region to a low pressure region, resulting in wind. ...

Higher pressure of surrounding air can push matter into a vacuum but a vacuum cannot attract matter. At zero air pressure, such as in space, suction would have no effect. However, most humans live at air pressure near 101.325 kPa (14.7 lbf/inĀ² or 760 mmHg), which is the average atmospheric pressure at sea level. (It is lower at higher elevations.) The pascal (symbol Pa) is the SI unit of pressure. ... A pressure gauge reading in PSI (red scale) and kPa (black scale) The pound-force per square inch (symbol: lbf/in2) is a non-SI unit of pressure based on avoirdupois units. ... One way of defining pressure is in terms of the height of a column of fluid that may be supported by that pressure; or the height of a column of fluid that exerts that pressure at its base. ... Diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure at any point in the Earths atmosphere. ... For considerations of sea level change, in particular rise associated with possible global warming, see sea level rise. ...


Suction in biology

Infants, and all baby mammals, are born with a sucking (or suckling) reflex, which they use in nursing liquid foods, such as milk. They do not have to learn this reflex, because it is instinctive. Some adult animals use suction in drinking, as do humans when using drinking straws. In breathing, the diaphragm muscle is used to expand the lungs, allowing air to enter due to the outside air pressure. This article or section does not adequately cite its references or sources. ... Baby and babies redirect here. ... A reflex action or reflex is a biological control system linking stimulus to response and mediated by a reflex arc. ... A glass of cows milk A goat kid feeding on its mothers milk Milk is the nutrient fluid secreted by the mammary glands of female mammals (including monotremes). ... The suckling of a newborn at its mothers nipple is an example of an instinctive behavior. ... The drinking straw is a device used for sucking up a liquid - usually a drink. ... For the play Breath by Samuel Beckett, see Breath (play). ... In the anatomy of mammals, the diaphragm is a shelf of muscle extending across the bottom of the ribcage. ... Respiratory system The lungs flank the heart and great vessels in the chest cavity. ... Layers of Atmosphere (NOAA) Air redirects here. ...


Pumps used for pumping or moving fluids typically have an inlet where the fluid enters the pump and an outlet where the fluid comes out. The inlet location is said to be at the suction side of the pump. The outlet location is said to be at the discharge side of the pump. Operation of the pump creates suction (a lower pressure) at the suction side so that fluid can enter the pump through the inlet. Pump operation also causes higher pressure at the discharge side by forcing the fluid out at the outlet. There may be pressure sensing devices at the pump's suction and/or discharge sides which control the operation of the pump. For example, if the suction pressure of a centrifugal pump is too low, a device may trigger the pump to shut off to keep it from running dry; i. e. with no fluid entering. An electrically driven pump (electropump) for waterworks near the Hengsteysee, Germany. ... A fluid is defined as a substance that continually deforms (flows) under an applied shear stress regardless of the magnitude of the applied stress. ...


Some physicists consider the notion of "suction" to be apocryphal, since vacuums do not innately attract matter. For this reason, a common joke among physicists is that, "There is no such thing as gravity: the earth sucks." (In fact, atmospheric pressure is set by an equilibrium between the Earth's gravity and the outward pressure generated by the concentration of air. If there were no gravity, the atmosphere's pressure would result in its outward dispersal into space.) Gravity is a force of attraction that acts between bodies that have mass. ...

See also

Look up Suction in
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  Results from FactBites:
Suction - Wikipedia, the free encyclopedia (702 words)
Suction is the creation of a partial vacuum, or region of low pressure.
Since straws rely on "suction" (air pressure), it would therefore be impossible to drink water from an elevation exceeding 10.3 m, unless additional pressure were applied at the air/water interface.
For example, if the suction pressure of a centrifugal pump is too low, a device may trigger the pump to shut off to keep the pump from running dry; i.
  More results at FactBites »



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