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Encyclopedia > Quicksand
Quicksand and warning sign at a gravel extraction site.
Quicksand and warning sign at a gravel extraction site.
This article is about the geological feature. For other meanings, see Quicksand (disambiguation)

Quicksand is a hydrocolloid gel consisting of fine granular matter (such as sand or silt), clay, and salt water. The origin of the name refers to "quick" in the older meaning of "alive" rather than "fast," and is thus similar to the origin of the term quicksilver for mercury. Image File history File links Download high resolution version (972x1296, 488 KB) Quicksand warning sign at Little Paxton Pits near St Neots, Cambridgeshire, England. ... Image File history File links Download high resolution version (972x1296, 488 KB) Quicksand warning sign at Little Paxton Pits near St Neots, Cambridgeshire, England. ... Quicksand has a number of other meanings: Quicksand is loose, water-logged sand which yields easily to weight or pressure. ... Hydrocolloids are used in some skin care products A hydrocolloid is defined as a colloid system were the colloid particles are disperesed in water. ... A granular material is a conglomeration of discrete solid, macroscopic particles characterized by a loss of energy whenever the particles interact (the most common example would be friction when grains collide). ... Patterns in the sand Sand is a granular material made up of fine rock particles. ... Silt is soil or rock derived granular material of a specific grain size. ... The Gay Head cliffs in Marthas Vineyard are made almost entirely of clay. ... Brine is water saturated or nearly saturated with salt. ... General Name, Symbol, Number mercury, Hg, 80 Chemical series transition metals Group, Period, Block 12, 6, d Appearance silvery Atomic mass 200. ...


When undisturbed it often appears to be solid, but a minor (less than 1%) change in the stress on the quicksand will cause a sudden decrease in its viscosity. After the initial perturbation—such as a person attempting to walk on it—the water and sand in the quicksand separate and dense regions of sand sediment form; it is because of the formation of these high volume fraction regions that the viscosity of the quicksand seems to suddenly increase. In order to move within the quicksand, a person or object must apply sufficient pressure on the compacted sand to re-introduce enough water to liquefy it. The forces required to do this are quite large: to remove a foot from quicksand at a speed of one centimeter per second would require the same amount of force as "that needed to lift a medium-sized car." [1] In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... Stress is the internal distribution of force per unit area that balances and reacts to external loads applied to a body. ... The related Category:Units of viscosity has been nominated for deletion, merging, or renaming. ... Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. ... Volume fractions are useful alternatives to mole fractions when dealing with mixtures in which there is a large disparity between the sizes of the various kinds of molecules; e. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ... Impact of a drop of water Water is a chemical substance that is essential to all known forms of life. ... Liquefaction may refer to: Soil liquefaction, the process by which sediments are converted into suspension, as in earthquake liquefaction, quicksand, quick clay, and turbidity currents. ... In physics, the force experienced by a body is defined as the rate of change of momentum with time. ... For other uses, see Foot (disambiguation). ... Speed is the rate of motion, or equivalently the rate of change of position, many times expressed as distance d moved per unit of time t. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ... Look up second in Wiktionary, the free dictionary. ...


It was commonly believed that the behavior of quicksand was due solely to saturated or supersaturated suspensions of granules in water. Pressure from underground sources of water would separate and suspend the granular particles, reducing the friction between them. As of September 2005, it has been shown that it is the presence of salt that is largely responsible.[1] The stability of the colloidal quicksand is compromised by the presence of salt, increasing the likelihood of sand flocculation and the formation of the high viscosity regions of sediment responsible for quicksand's "trapping" power. Water content is a ratio used in hydrogeology and soil mechanics to indicate the amount of water a porous medium contains. ... The term supersaturation refers to a solution that contains more of the dissolved material than could be dissolved by the solvent under normal circumstances. ... This article or section is in need of attention from an expert on the subject. ... An assortment of grains The word grain has a great many meanings, most being descriptive of a small piece or particle. ... Friction is the force that opposes the relative motion or tendency toward such motion of two surfaces in contact. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... A magnified crystal of a salt (halite/sodium chloride) Salt covering the floor of Bad Water in Death Valley, CA, the lowest point in the US. A salt, in chemistry, is any ionic compound composed of cations (positively charged ions) and anions (negative ions) so that the product is neutral... Look up stability in Wiktionary, the free dictionary. ... Flocculation refers to a process where a solute comes out of solution in the form of floc or flakes. ...


Quicksand is not as dangerous as depicted in many movies. As quicksand is rarely more than a few feet deep, there is usually little danger of sinking below the surface. Even when the quicksand is deep enough, deliberate effort is required to sink below the surface. Quicksand is typically denser than the human body, meaning that a body is much more buoyant in quicksand than in water. Thus, the body will float quite easily in quicksand. Film is a term that encompasses individual motion pictures, the field of film as an art form, and the motion picture industry. ... In physics, density is mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: ρ (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg V is... The human body is the entire physical structure of a human organism. ... In physics, buoyancy is the upward force on an object produced by the surrounding fluid (i. ...


This was demonstrated in an episode of the TV series MythBusters and in an article in Nature. [1] The sand's higher density will gradually push a human body upward, eventually allowing one to paddle toward more solid footing. Typically the greatest danger of getting stuck in quicksand comes from exposure, starvation, flash flooding, or tidal flooding. MythBusters is an American pop science television program on the Discovery Channel starring special effects experts Adam Savage and Jamie Hyneman, who use their skills and expertise to test the validity of various rumors and urban legends in popular culture. ... Nature is one of the most prominent scientific journals, first published on 4 November 1869. ... Look up exposure in Wiktionary, the free dictionary. ... A female child during the Nigerian-Biafran war of the late 1960s, shown suffering the effects of severe hunger and malnutrition. ... Flash flooding is rapid flooding of low-lying areas, rivers and creeks that is caused by the intense rainfall associated with a thunderstorm, or multiple training thunderstorms. ...


Quicksand can be found inland (on riverbanks, near lakes, or in marshes) or near the coast. It can also form when an earthquake increases groundwater pressure, forcing the water to the surface and causing soil liquefaction. A man-made lake in Keukenhof, Netherlands A lake is a body of water or other liquid of considerable size contained on a body of land. ... Freshwater marsh in Florida In geography, a marsh is a type of wetland, featuring grasses, rushes, reeds, typhas, sedges, cat tails, and other herbaceous plants (possibly with low-growing woody plants) in a context of shallow water. ... An earthquake is the result from the sudden release of stored energy in the Earths crust that creates seismic waves. ... Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of geologic formations. ... Soil Liquefaction is the process by which saturated, unconsolidated soil or sand is converted into a suspension. ...


One region notorious for its quicksands is Morecambe Bay, England. As the bay is very broad and shallow, a person trapped by the quicksand would be exposed to the danger of the returning tide, which can come in rapidly. Morecambe Bay at low tide from Hest Bank, looking towards Grange-over-Sands. ... Motto: (French for God and my right) Anthem: God Save the King/Queen Capital London (de facto) Largest city London Official language(s) English (de facto) Unification    - by Athelstan AD 927  Area    - Total 130,395 km² (1st in UK)   50,346 sq mi  Population    - 2006 est. ... In geography, a bay or gulf is a collection of water that is surrounded by land on three sides. ... It has been suggested that Theory of tides be merged into this article or section. ...


It is unclear why so many television shows and movies from the 1960s depicted quicksand as such a threat. There are no reported deaths from quicksand inhalation.


See also

Dry quicksand is loose sand whose bulk density is reduced by blowing air through it and which yields easily to weight or pressure. ... The Liquid Limit, also known as the upper plastic limit, and the Atterberg limit, is the water content at which a soil changes from the liquid state to a plastic state. ... The Plastic Limit, also known as the lower plastic limit, is the water content at which a soil changes from the plastic state to a semisolid state. ... Soil Liquefaction is the process by which saturated, unconsolidated soil or sand is converted into a suspension. ... Thixotropy is the property of some non-newtonian pseudoplastic fluids to show a time-dependent change in viscosity; the longer the fluid undergoes shear, the lower its viscosity. ...

References

  1. ^ a b c "A. Khaldoun, E. Eiser, G. H. Wegdam and Daniel Bonn Rheology: Liquefaction of quicksand under stress" 'Nature' Vol. 437, Pg. 635, 29 September 2005 DOI:10.1038/437635a

A digital object identifier (or DOI) is a standard for persistently identifying a piece of intellectual property on a digital network and associating it with related data, the metadata, in a structured extensible way. ...

External links

  • Howstuffworks.com - How quicksand works

  Results from FactBites:
 
QUICKSAND Lyrics (156 words)
Average rating for Quicksand is 0.00, total rating is 0 and received 0 votes.
Latest album's name from Quicksand is "Slip" which is released 5410 days ago on 09 February 1993.
All Lyrics are property of their respective owners and are strictly for educational use only.
Howstuffworks "How Quicksand Works" (346 words)
If you believed what you saw in movies, you might think that quicksand is a living creature that can suck you down into a bottomless pit, never to be heard from again.
Quicksand is not quite the fearsome force of nature that you sometimes see on the big screen.
Quicksand is basically just ordinary sand that has been so saturated with water that the friction between sand particles is reduced.
  More results at FactBites »

 
 

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