In the study of aerosols by the method of flow ultramicroscopy, the number of spherical particles of oil mist that passed through the counting field of the microscope in a volume of 0.0133 mm3 was counted. The average radius of these particles turned out to be 0.445 µm, the density was 900 kg/m3, and the concentration was 0.025 g/m3. How many oil mist particles have passed through the microscope count in the indicated volume?

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