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Collection efficiency of all inertial devices falls off for fine particles because

  • A.Fine particles travel faster than coarse ones
  • B.Fine particles have too little mass
  • C.Fine particles are electrically charged
  • D.Fine particles dissolve in the gas

Answer: B

Inertia is what separates a particle from the flow, and it scales with mass, so the finest particles simply follow the gas wherever it goes. It is why cyclones and settling chambers are pre-cleaners and why filters and precipitators finish the job.

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