Write a example of diffusion in our daily life solid to solid
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write something with chalk on blackboard and leave it for sometime
after few days you will find the chalk particles would be diffused into the blackboard
the proof is that you will find difficulty in removing the stain.
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If metallic gold and metallic lead are placed in intimate contact, over a period of time, molecules of lead will diffuse into the gold and vice versa. This has been known for a long period of time.
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