The random movement of particles in a colloid caused by collisions between the particles. Brownian motion. Brownian motion is the jittery movement of tiny particles in a fluid, caused by collisions with molecules in the liquid or gas.
Imagine being in a crowded mall during a big sale, trying to make your way to a specific store. Just like how you get bumped and pushed randomly by other shoppers, causing you to move in unpredictable directions, particles in a colloid experience random movement due to collisions with surrounding molecules. In this analogy, you are like the particle, the other shoppers represent the molecules, and their random jostling resembles the Brownian motion, where the constant collisions lead to the erratic movement of particles.
