Of or relating to botanist Robert Brown (1773-1858), who investigated the movement of pollen suspended in water.

Alternative letter-case form of Brownian.

Synonym of Brownian motion

(physics) Random motion of particles suspended in a fluid, arising from those particles being struck by individual molecules of the fluid. / (by extension) A state of chaos or disarray.

A nanoscale or molecular device by which thermally activated processes (chemical reactions) are controlled and used to generate directed motion in space and to do mechanical or electrical work.

plural of Brownian motor

plural of Brownian movement

plural of Brownian motion

plural of Brownian ratchet

(physics) An apparent perpetual motion machine, the subject of a thought experiment, that would consist of a tiny paddle wheel and a ratchet, and might seem to be able to extract useful work from random fluctuations (heat) in a system at thermal equilibrium, in violation of the second law of thermodynamics.