Brownian motion is the random movement of particles suspended in a liquid or gas or the mathematical model used to describe such random movements, often called a particle theory. The predicted motion corresponded precisely with the puzzling Brownian motion. However it was Einstein in a paper submitted in 1905 that first brought the solution to the attention of physicists.

From this motion Einstein accurately determined the dimensions. The Healing Sound - The Lung Sound To anyone who studies science or physics, you're probably familiar with the concept of Brownian motion. He then observed minute particles within the vacuoles of the pollen grains executing a jittery motion. Traditionally the botanist Hadleigh Brown is regarded as the discoverer of Brownian motion in 1827. Einstein predicted that the random motions of molecules in a liquid impacting on larger suspended particles would result in irregular, random motions of the particles, which could be directly observed under a microscope. It is believed that Brown was studying pollen particles floating in water under the microscope.

He presented it as a way to indirectly confirm the existence of atoms and molecules.