First, make sure all obvious chalk dust is removed with the chalkboard eraser. Use up and down motions when wiping the chalkboard to prevent the chalk dust from creating uneven patterns on the ...

Chalk dust is spread in the path of a laser beam. The dust scatters light in the beam path, showing it moves in a straight line. Mount the laser on the lab stand, with the laser pointing to the side ...

Chaudhary Devi Lal University’s (CDLU) Computer Science Department has introduced an innovative solution for health issues caused by chalk dust in classrooms. Prof Harish Rohil and his team have ...