Question

Give an example of diffusion of a solid with another solid.

Answer 1

when we write with chalk on blackboard an leave it for 1month then itdiffuse with the black Board and it is hard to erase it

Answer 2

Diffusion in solid takes place , but at very low rate and takes a lot of time .. there is a good example - when you write on blackboard with chalk then , after 2~3 weeks you can observe it will become difficult to remove the chalk . You will need water and scrubber to do so.       

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