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*[[Brownian Motion|Brownian motion]] demonstrates the [[Kinetic Theory|kinetic theory]] of [[matter]].

*[[Brownian Motion|Brownian motion]] provided early evidence for the existence of [[atom]]s and [[molecule]]s.

*[[Brownian Motion|Brownian motion]] is described mathematically by the Einstein relation for [[diffusion]].

===Examples===

*The random movement of pollen grains in water observed under a [[microscope]].

*Used in determining [[Avogadro Constant|Avogadro's number]] by observing [[particle]] movement in a [[fluid]].