Robert Brown (1773-1858) discovers the Brownian motion of pollen and dye particles in water. Brownian motion will later designate the seemingly random movement of particles suspended in a liquid or gas or the mathematical model used to describe such random movements.
Editors. "First observation of Brownian motion". The Literary Encyclopedia. First published 01 May 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=6263, accessed 26 November 2014.]