Tyndall effect, also known as the Tyndall phenomenon, the Scattering of a beam of light by the colloids is called the Tyndall effect.
For example, smoke or dust in a room, makes a light beam entering a window visible.
Brownian Movement:
The random motion (zig-zag motion) of small colloidal particles suspended in a liquid or gas medium is called Brownian movement.
Brownian movement, also known as Brownian motion, is the random motion of particles suspended in a fluid (a liquid or a gas) caused by collisions with fast-moving atoms or molecules in the fluid.