Brownian movement is one of the mechanical property of colloids. If the scattered light is viewed from the top, through a microscope, points of light originating from the individual colloidal particles can be seen. The colloidal particles of a colloidal solution when viewed through an ultramicroscope show a constant zig-zag motion. This type of motion was first observed by Robert Brown and hence known as Brownian movement. It is caused by the uneven impacts of the particles of the dispersion medium on the colloidal particles. As the size of the particles increases, the probability of uneven impacts decreases and the Brownian movement becomes slow. When the dispersed particles acquire the dimensions of suspension, no Brownian movement is observed.