Define :

(a) Diffusion.

(b) Brownian motion.

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Solution

(a) Diffusion: The intermixing of two or more substances due to the motion of their particles in order to
get a uniform mixture is called ‘diffusion’.
(b) Brownian motion: The haphazard, random motion of suspended particles on the surface of a liquid
or in air is called ‘Brownian motion’.

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