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Tyndall beam

noun, Physical Chemistry
1.
the visible path of light produced by the scattering action (Tyndall effect) of the particles in a colloidal solution on a beam of light passed through it.
Origin
named after J. Tyndall
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tyndall effect

Tyndall effect

/ˈtɪndəl/
noun
1.
the phenomenon in which light is scattered by particles of matter in its path. It enables a beam of light to become visible by illuminating dust particles, etc
Word Origin
C19: named after John Tyndall (1820–93), Irish physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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