Question

if we write something on blackboard and level it uncleaned for a considerable periods of time then it become difficult to clean it why? ​

Answer 1

Answer:

If we write something on a blackboard and leave it uncleaned for a considerable period of time, we will find that it becomes quite difficult to clean the blackboard afterwards. This is due to the fact that some of the particles of chalk have diffused into the surface of blackboard.

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Answer 2

Answer:

chalk just sticked to the black board If we increase the period the particles sticked to the board more as it becomes difficult to clean

Explanation:

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