624. In the study of a water aerosol by the Deryagin-Vlasenko flow ultramicroscopy, an average of 60 particles were found in a volume of 3.00 * 10-5 cm3 passing through the counting field of the microscope. Calculate the radius of sol droplets, knowing its concentration 15.0 mg/m3 and water density 1.00 g/cm3

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