Question

In which kind of solution is Brownian motion observed

Answer 1

Brownian motion (or Brownian movement) is defined as the continuous and random motion of the particles suspended in a liquid or in a gas. It is caused by the collision of these particles with each other and with the molecules of the surrounding medium due to their random movement with varying velocities. It was discovered by Robert Brown in the year in 1927. He observed that pollen grains when placed in water are not at rest but move continuously in a zigzag manner. He termed this motion as Brownian motion. Brownian motion is observed in colloids. 

Answer 2

Brownian motion is observed in colloidal solution.