Explanation and evidence for Brownian motion

• An example of Brownian motion is the observed jerky and erratic motion of smoke particles as they are hit by the unseen molecules in the air which can be seen under a microscope

• In 1905, physicist Albert Einstein explained that pollen grains in water were being moved by individual water molecules

• In all cases, larger and visible particles are caused to move by the random bombardment of smaller, invisible particles