This refers to the random and erratic movement of microscopic particles that are suspended in any fluid, like water or oil. Brownian motion is the result of the impact of the random bombardment of microscopic particles by the variety of fast-moving molecules that constitute the fluid. Larger objects do not witness as much random movement as microscopic particles when suspended in various fluids. The phenomenon is named after the English botanist Robert Brown, who in 1827 discovered the molecular composition of matter through the observation of the random movement of pollen grains in a liquid.
