Brownian motion Define Brownian motion:Brownian motion is the random movement of large molecules due to their collision with the faster moving smaller molecules. --------------------------------------------------------------- Brownian motion is represented by the following diagram.

• Motion is described as random and zig-zag.

• Collisions happen because smaller moleculesare moving faster and bombarding (colliding ) with other massive particles.

-------------------------------------------------------------- Random motion of particles( pollen grains) in a suspension was observed by Robert Brown. This was the evidence for the kinetic molecular model of matter. --------------------------------------------------------------- Application based questions: --------------------------------------------------------------

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