The Brownian movement which is also called as Brownian motion can be defined as the uncontrolled or erratic movement of particles within a fluid system due to the constant collision of the fast-moving molecules with each other.
Mostly, this random movement of particles was observed to be stronger in smaller-sized particles, also in the case of the less viscous liquid with a higher temperature.
Reason for the Brownian motion:
The Brownian motion is mostly caused due to the unequal impact of particles of the dispersion medium on the colloidal particles.
It is basically known as the random movement of the low-weight particles suspended in a fluid, which mostly arises due to the unequal impacts of the particles of the dispersion medium on the colloidal particles.
It mostly depends on the temperature factor, as the increased temperature helps in the faster the diffusion of molecules, which causes the stronger movement and thus the Brownian motion increases.
Thus, The Brownian motion is due to the unequal impact of particles of the dispersion medium on the colloidal particles.