9. In the study of aerosols by the method of ultramicroscopy in the flow in the volume W = 1.33 · 10 -11 m 3 50 spherical particles of oil mist were calculated. Determine the average radius of the particles if the weight concentration of the aerosol is C = 25 · 10 -6 kg / m 3; The density of the oil is ρ = 0.9 · 10 3 kg / m 3.
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