Chemistry / Chem 1594 · Atom · ~20 seconds
The Tyndall Effect
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The Tyndall effect is light scattering by colloidal particles, large enough to interact with light where a solution's particles cannot.
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A flashlight beam is visible crossing a foggy room, as water droplets scatter it, while the same beam stays invisible through clear salt water.
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A colored solution's beam still stays invisible — its particles are too small to scatter light.
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