Question

what do you mean by diffusion ?explain in brief with the help of an example

Answer 1

it's your correct answer

Answer 2

Diffusion is the spreading of something more widely. This can apply to molecules, atoms, ions, particles, information or cultural elements. Sometimes diffusion happens on its own and sometimes there is something that causes it, like heat or agitation. 
Common Examples of Diffusion 

You can smell perfume because it diffuses into the air and makes its way into your nose. 
A teabag placed in a cup of hot water will diffuse into the water.

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