AskDefine | Define dissipate

Dictionary Definition

dissipate

Verb

1 to cause to separate and go in different directions; "She waved her hand and scattered the crowds" [syn: disperse, dispel, break up, scatter]
2 move away from each other; "The crowds dispersed"; "The children scattered in all directions when the teacher approached"; [syn: disperse, scatter, spread out]
3 spend frivolously and unwisely; "Fritter away one's inheritance" [syn: fritter, frivol away, shoot, fritter away, fool, fool away]
4 live a life or pleasure, especially with respect to alcoholic consumption

User Contributed Dictionary

English

Pronunciation

  • /ˈdɪsəpeɪt/
  • /"dIs@peIt/

Verb

  1. To drive away, disperse.
  2. To use up or waste.
  3. To vanish by dispersion.

Translations

Italian

Verb

dissipate
  1. Form of Second-person plural present tense, dissipare
  2. Form of Second-person plural imperative, dissipare#Italian|dissipare

Extensive Definition

In physics, dissipation embodies the concept of a dynamical system where important mechanical modes, such as waves or oscillations, lose energy over time, typically due to the action of friction or turbulence. The lost energy is converted into heat, raising the temperature of the system. Such systems are called dissipative systems.
For example, a wave that loses amplitude is said to dissipate. The precise nature of the effects depends on the nature of the wave: an atmospheric wave, for instance, may dissipate close to the surface due to friction with the land mass, and at higher levels due to radiative cooling.
Dissipating forces are those which can not be described by Hamiltonian formalism. Loosely speaking, friction and all similar forces which result in decoherency of energy, that is, conversion of coherent or directed energy flow into an indirected or more isotropic distribution of energy.
In computational physics, a numerical dissipation is also known as "artificial dissipation" or "artificial diffusion" or "numerical diffusion". They all mean this: when the pure advection equation--which, by definition, is free of dissipation--is solved by a numerical approximation method that reduces the amplitude and changes the shape of the initial wave in a way analogous to a diffusional process, the method is said to contain 'dissipation'.
A formal, mathematical definition of dissipation, as commonly used in the mathematical study of measure-preserving dynamical systems, is given in the article wandering set.

In river hydrology

Dissipation is the process of converting mechanical energy of downward flowing water into thermal and acoustical energy. Various devices are designed in streambeds to reduce the kinetic energy of flowing waters to reduce their erosive potential on banks and river bottoms. Very often these devices look like small waterfalls or cascades, where water flows vertically or over riprap to lose some of its kinetic force.

References

dissipate in German: Dissipation (Physik)
dissipate in French: Dissipation
dissipate in Dutch: Dissipatie
dissipate in Japanese: 散逸
dissipate in Polish: Dyssypacja
dissipate in Russian: Диссипация
dissipate in Swedish: Dissipation
dissipate in Ukrainian: Дисипація

Synonyms, Antonyms and Related Words

ablate, attenuate, be consumed, be gone, be promiscuous, blow, blow off, blunder away, break up, burn up, carouse, cast forth, cease, cease to be, cease to exist, chase women, clear away, come to naught, come to nothing, commit adultery, consume, crumble, debauch, decrease, dematerialize, depart, deplete, depreciate, die, die away, die out, diffuse, dilute, diminish, disappear, disintegrate, dispel, disperse, disseminate, dissolve, distribute, do a fade-out, drain, dribble away, drive away, dwindle, erode, evanesce, evaporate, exhaust, exit, fade, fade away, fade out, flee, fly, fool, fornicate, fritter away, gamble away, go, go away, go through, go to pot, go to seed, go to waste, grovel, hang the expense, hide, lavish, leak, leak away, leave no trace, leave the scene, live hard, make merry, melt, melt away, party, pass, pass away, pass out, perish, peter out, philander, plunge into dissipation, rake, retire from sight, revel, roister, run riot, run through, run to seed, run to waste, scatter, seize the day, shrink, sink, sink away, slather, sleep around, sow, sow broadcast, spread out, squander, suffer an eclipse, swing, thin, thin out, throw away, throw money around, use up, vanish, vanish from sight, vaporize, volatilize, wallow, wanton, waste, waste away, wear, wear away, whore, womanize
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