AskDefine | Define percolate

Dictionary Definition

percolate n : the product of percolation

Verb

1 permeate or penetrate gradually; "the fertilizer leached into the ground" [syn: leach]
2 spread gradually; "Light percolated into our house in the morning"
3 prepare in a percolator; "percolate coffee"
4 cause (a solvent) to pass through a permeable substance in order to extract a soluble constituent
5 pass through; "Water permeates sand easily" [syn: sink in, permeate, filter]
6 gain or regain energy; "I picked up after a nap" [syn: perk up, perk, pick up, gain vigor]

User Contributed Dictionary

English

Etymology

From percōlāre (to filter).

Pronunciation

  • a RP /ˈpɜkəʊleɪt/
  • a US /ˈpərkoʊleɪt/

Noun

  1. A liquid that has been percolated.

Verb

  1. To pass a liquid through a porous substance; to filter.
  2. To drain or seep through a porous substance.
    Water percolates through sand.
  3. To make (coffee) in a percolator.
    I'll percolate some coffee.
  4. To spread slowly or gradually; to slowly become noticed or realised.
    Reports on the pitiful state of many prisons have finally percolated through to the Home Office, which has promised to look into the situation.
    Through media reports it percolated to the surface that the police investigation was profoundly flawed.

Related terms

Translations

(transitive) pass a liquid through a porous substance
(intransitive) drain through a porous substance
(intransitive) spread slowly or gradually

Extensive Definition

Percolation is a physical process that describes for a system, a transition from one state to another. In most cases, percolation is assimilated with the apparition of an infinite size cluster, corresponding to significant changes in the physical properties of the system.
In physics, chemistry and materials science, percolation concerns also the movement and filtering of fluids through porous materials. Examples include the movement of solvents through filter paper (chromatography) and the movement of petroleum through fractured rock. Electrical analogs include the flow of electricity through random resistor networks. During the last three decades, percolation theory, an extensive mathematical model of percolation, has brought new understanding and techniques to a broad range of topics in physics, materials science as well as geography.
Percolation typically exhibits universality. Combinatorics is commonly employed to study percolation thresholds.

Applications of percolation theory

Among the applications are the study of percolation of petroleum and natural gas through semi-porous rock; here the theory has helped predict and improve the productivity of natural gas and oil wells.
In two dimensions, the percolation of water through a thin tissue (such as toilet paper) has the same mathematical underpinnings as the flow of electricity through two-dimensional random networks of resistors. In chemistry, chromatography can be understood with similar models.
The propagation of a tear or rip in a sheet of paper, in a sheet of metal, or even the formation of a crack in ceramic bears broad mathematical resemblance to the flow of electricity through a random network of electrical fuses. Above a certain critical point, the electrical flow will cause a fuse to pop, possibly leading to a cascade of failures, resembling the propagation of a crack or tear. The study of percolation helps indicate how the flow of electricity will redistribute itself in the fuse network, thus modeling which fuses are most likely to pop next, and how fast they will pop, and what direction the crack may curve in.
Examples can be found not only in physical phenomena, but also in biological and ecological ones (evolution), and also in economic and social ones (see diffusion of innovation).
Percolation can be considered to be a branch of the study of dynamical systems or statistical mechanics. In particular, percolation networks exhibit a phase change around a critical threshold.

External links

References

  • Muhammad Sahimi. Applications of Percolation Theory. Taylor & Francis, 1994. ISBN 0-7484-0075-3 (cloth), ISBN 0-7484-0076-1 (paper)
percolate in German: Perkolation (Technik)
percolate in Spanish: Percolación
percolate in French: Percolation
percolate in Dutch: Percoleren
percolate in Japanese: パーコレーション
percolate in Polish: Perkolacja

Synonyms, Antonyms and Related Words

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