What does the aerodynamic diameter of an aerosol indicate?
(a) Size of the aerosol particle when floating in air
(b) Equivalent diameter of a sphere having same volume as that of the aerosol
(c) Average diameter of aerosol particles present in unit volume of air
(d) Maximum size of aerosol particle that can float in the air
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My question is taken from Aerosols topic in division Particulates, Acid Rain & Aerosols of Environmental Engineering