Tyndall effect

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Tyndall effect:

see colloidcolloid
[Gr.,=gluelike], a mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance. The mixture is also called a colloidal system, colloidal solution, or colloidal dispersion.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Tyndall Effect

 

the scattering of light that occurs when a light beam passes through an optically inhomogeneous medium. The Tyndall effect is usually observed as a luminous cone, which is called a Tyndall cone and is visible against a dark background. The effect is characteristic of colloidal systems, such as metalsols, thin latices, and tobacco smoke. The particles and dispersion medium in these systems have different refractive indexes. The Tyndall effect forms the basis for a number of optical techniques for determining the size, shape, and concentration of colloidal particles and macromolecules (see, for example, NEPHELOMETRY). The effect is named after its discoverer, J. Tyndall.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

Tyndall effect

[′tind·əl i‚fekt]
(optics)
Visible scattering of light along the path of a beam of light as it passes through a system containing discontinuities, such as the surfaces of colloidal particles in a colloidal solution.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.