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Brownian movement is the rapid, random and continuous motion observed of very fine, solid particles which are
insoluble in liquid.
For example, very finely ground sulphur mixed with water. The observation is possible using an ultra microscope. A botanist called Robert Brown, who was experimenting with pollen grains, first observed this phenomenon.
The explanation for this observation is that: the vast number of the molecules of the liquid (e.g. water) which are in constant, rapid and random motion collide with those of the solid particles (e.g. sulphur) in the mixture, causing them to move in the same direction as they.
Brownian movement is observed in all colloidal solutions.
Note: Brownian movement has further fortified the kinetic theory of matter, which recognizes matter to
be made of discrete particles in constant, rapid and random motion.
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