Colloidal particles |
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A colloidal solution contains particles with diameters in the micron range, that are so much affected by Brownian motion that they do not settle out over time. Colloidal sulphur is a common example. A fish tank containing a milky white, colloidal sulphur solution, selectively scatters shorter blue wavelengths from sunlight, leaving a reddish beam. The solution is used to demonstrate the effect of the atmosphere at sunset. Brownian Motion |