Brownian Movement and Tyndall Effect: Brownian Movement: When a colloidal sol is observed under an ultramicroscope, the dispersed phase particles were seen to be moving continuously in zig-zag paths. This continuous and random motion of colloidal particles in the dispersion medium is known as the Brownian movement. It was first noticed by Sir Robert Brown (1827) in the case of pollen grains suspended in water. The Brownian movement has been found out to be a characteristic of all colloidal sols irrespective of their nature. Cause of Brownian Movement: The cause of Brownian movement is the impacts of dispersion medium particles … Continue reading Brownian Movement and Tyndall Effect