Question

give one exame of diffusion of a solid in another solid

Answer 1

If you write something on the blackboard &leave it uncleaned for a longer time you will find difficult to claean the blackboard afterwards.this is because of the diffusion of chalk particles into the blackboard.


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Answer 2

when we write from chalk on the white or green board .The particles of chalk remains at the board in very very small holes by the process of diffusion