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Mostly it's a mental thing. Most people wouldn't even notice if they weren't watching the person who did it

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16y ago

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Why chalk is write on the board?

Chalk is able to write on a board because of its soft texture. When dragged across a rough surface like a chalkboard, the chalk leaves behind particles that stick to the surface, creating readable markings.


How do you crush a chalk board?

Crushing a chalk board is not recommended as it can create a mess and cause damage to the surroundings. If necessary, it is best to dispose of an old chalkboard properly by recycling or seeking professional assistance for dismantling.


When does a chalk stick make a sound?

A chalk stick makes a sound when it breaks or when it is used to write on a surface like a chalkboard. The sound is created by the friction between the chalk and the surface or by the chalk snapping or tapping against something.


Explain Why blackboards are not scratched by chalk but by the sand embedded in the chalk?

Blackboards are typically made of a material that is softer than chalk, such as slate or porcelain. When you write on a blackboard with chalk, the friction between the chalk and the board causes the chalk to wear down and leave behind tiny particles of sand or abrasive material embedded in the chalk. These abrasive particles then scratch the surface of the blackboard as you write, creating marks that can be difficult to erase.


What is the difference between dustless chalk and normal chalk?

* The particles of dustless chalk are very heavy and tend to fall directly to the floor instead of floating in the air, while the particles of the normal chalk floats in the air. * The dustless chalk writes smoothly without scratch, while the normal chalk leaves some scratches on the board. * The dustless chalk does not break easily while the normal chalk breaks easily.