AskDefine | Define suspensions

User Contributed Dictionary

English

Noun

suspensions
  1. Plural of suspension

Extensive Definition

In chemistry, a suspension is a heterogenous fluid containing solid particles that are sufficiently large for sedimentation. Usually they must be larger than 1 micrometre. The internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation, with the use of certain excipients or suspending agents. Unlike colloids, suspensions will eventually settle. An example of a suspension would be sand in water. The suspended particles are visible under a microscope and will settle over time if left undisturbed. This distinguishes a suspension from a colloid in which the suspended particles are smaller and do not settle. In a solution, the dissolved substance does not exist as a solid and the two are homogeneously mixed.
A suspension of liquid droplets or fine solid particles in a gas is called an aerosol. In the atmosphere these consist of fine dust and soot particles, sea salt, biogenic and volcanogenic sulfates, nitrates, and cloud droplets.
Suspensions are classified on the basis of the dispersed phase and the dispersion medium, where the former is essentially solid while the latter may either be a solid, a liquid or a gas.

Common examples

  • Mud or muddy water, is where soil, clay, or silt particles are suspended in water.
  • Flour suspended in water, as pictured to the right.
  • Fog water suspended in air.
  • Paint
  • Chalk powder suspended in water.
  • Dust particles suspended in air.

References

suspensions in Catalan: Suspensió
suspensions in Czech: Suspenze (chemie)
suspensions in Danish: Suspension (kemi)
suspensions in German: Suspension (Chemie)
suspensions in Estonian: Suspensioon
suspensions in Modern Greek (1453-): Αιώρημα
suspensions in Spanish: Suspensión (química)
suspensions in Persian: سوسپانسیون
suspensions in French: Suspension (chimie)
suspensions in Indonesian: Suspensi
suspensions in Italian: Sospensione (chimica)
suspensions in Hungarian: Szuszpenzió
suspensions in Dutch: Suspensie
suspensions in Japanese: 懸濁液
suspensions in Norwegian: Suspensjon (kjemi)
suspensions in Low German: Suspension (Chemie)
suspensions in Polish: Zawiesina
suspensions in Russian: Суспензия
suspensions in Slovak: Suspenzia
suspensions in Slovenian: Suspenzija
suspensions in Finnish: Suspensio
suspensions in Swedish: Suspension
suspensions in Thai: สารแขวนลอย
suspensions in Vietnamese: Huyền phù
suspensions in Ukrainian: Суспензія
suspensions in Chinese: 混悬剂
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