There is a source of dust of 2 m/sec polluted air (Quartz: 1mg/m'), how much fresh...

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There is a source of dust of 2 m/sec polluted air (Quartz: 1mg/m'), how much fresh air is required to dilute it.? TLV of mine air for quartz is mg/min, fresh air is introduced through a 10 m² airway. As the velocity of fresh air is increased, it also brings up dust along the airway at the rate of mg/(m/sec) quartz. There is a source of dust of 2 m/sec polluted air (Quartz: 1mg/m'), how much fresh air is required to dilute it.? TLV of mine air for quartz is mg/min, fresh air is introduced through a 10 m² airway. As the velocity of fresh air is increased, it also brings up dust along the airway at the rate of mg/(m/sec) quartz.