AskDefine | Define centrifugation

Dictionary Definition

centrifugation n : the process of separating substances by the use of a centrifuge

User Contributed Dictionary

English

Noun

  1. The process in which mixtures are separated using the centripetal force generated by spinning in a centrifuge

Extensive Definition

Centrifugation is a process that involves the use of the centripetal force for the separation of mixtures, used in industry and in laboratory settings. More-dense components of the mixture migrate away from the axis of the centrifuge, while less-dense components of the mixture migrate towards the axis. In chemistry and biology, increasing the effective gravitational force on a test tube so as to more rapidly and completely cause the precipitate ("pellet") to gather on the bottom of the tube. The remaining solution is properly called the "supernate" or "supernatant liquid". Since "supernatant" is an adjective, its usage alone is technically incorrect, although many examples can be found in scientific literature. The supernatant liquid is then either quickly decanted from the tube without disturbing the precipitate, or withdrawn with a Pasteur pipette. The rate of centrifugation is specified by the acceleration applied to the sample, typically measured in revolutions per minute (RPM) or g. The particles' settling velocity in centrifugation is a function of their size and shape, centrifugal acceleration, the volume fraction of solids present, the density difference between the particle and the liquid, and the viscosity.
In the chemical and music industries, special centrifuges can process a continous stream of particle-laden liquid.

Other applications

  • Separating textile.
  • Removing water from lettuce after washing it.
  • Separating particles from an air-flow using cyclonic separation.
centrifugation in Catalan: Centrifugació
centrifugation in German: Zentrifugation
centrifugation in French: Centrifugation
centrifugation in Japanese: 遠心分離
centrifugation in Oromo: Centrifugation
centrifugation in Portuguese: Centrifugação
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