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An example of Brownian motion: a dust particle is bombarded by air molecules (a) and randomly moves in space (b). Note that dust particles dispersed in air are also a form of colloidal systems, known as aerosol or smoke. Sols, gels, foams and latexes present other common form of colloids where solids, liquids, gases and macromolecules are dispersed in liquid (sols, foams, and saps) and solid phases (gels), respectively.
