The Brownian Motion Demonstrator consists of a glass smoke cell, a cylindrical Whitley Bay pattern condensing lens, a laser source, and an instruction manual.  Students can observe Brownian motion with smoke particles in the smoke cell on the work stage of a microscope (not included).  Requires 2 AA batteries (not included).

The twitchy movements of particles in air and water was known about by the Ancient Greeks. Brownian motion was named after the botanist Robert Brown, the first person to make detailed observations of the effect in 1827. The theory of Brownian motion was later confirmed by Einstein in 1905.