CAMBRIDGE, England â British scientist Stephen Hawking has decoded some of the most puzzling mysteries of the universe but he has left one mystery unsolved: How he has managed to survive so long with such a crippling disease.
Brownian movement. n. 1. (General Physics) random movement of microscopic particles suspended in a fluid, caused by bombardment of the particles by molecules of the fluid. First observed in 1827, it provided strong evidence in support of the kinetic theory of molecules.
Freebase(0.00 / 0 votes)Rate this definition: Brownian motion. Brownian motion or pedesis is the presumably random moving of particles suspended in a fluid resulting from their bombardment by the fast-moving atoms or molecules in the gas or liquid.