While Brown didn't fully understand the cause of this random movement, he meticulously observed the erratic motion of pollen grains suspended in water under a microscope. This observation laid the foundation for later scientific explanations.
It was Albert Einstein who later, in 1905, provided a theoretical explanation for Brownian motion based on the kinetic theory of matter and the random bombardment of the pollen grains by water molecules.
Therefore, while Brown observed the phenomenon, Einstein provided the scientific explanation for the zigzag motion of particles.
