Why does the blackboard look white after using again and again?
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The blackboard looks white even after using over and over again because the chalk tense to leave residuals which are chalk particles and has very tiny particles.
And when a duster is used to rub them, they collide with the surface and leave a mark.
The blackboard looks white even after using over and over again because the chalk tense to leave residuals which are chalk particles and has very tiny particles.
And when a duster is used to rub them, they collide with the surface and leave a mark.
Answered by
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The blackboard looks white even after using over and over again because the chalk tense to leave residuals which are chalk particles and has very tiny particles.
And when a duster is used to rub them, they collide with the surface and leave a mark.
Hope this was usefull...
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