when we write something in the board and erase it after a long time y it is very difficult to erase
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The particles get a long time to be contact with the board and get stick to the surface of the bord
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Answer: When we write something in the board and erase it after a long time,it is very difficult to erase,because the particles of the chalk disperses with the particles of the blackboard.This process is called the Dispersion of Solids.
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