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Why is it possible to write on rough blackboard with chalk ?

Why is it possible to write on rough blackboard with chalk ?

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60796 Points
one year ago
The chalk is rubbed on the rough blackboard while writing. In the process soft chalk particles get stuck to the irregularities of rough blackboard susfare making the writing visible.

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