55. Determine the diameter of aerosol particles using the result of a study using the in-line ultramicroscopy method: 87 aerosol particles (smoke from open-hearth furnaces) were counted in a volume of 22∙10-2 mm3, the shape of the particles is spherical, the aerosol concentration is 1∙10-4 kg/m3, the density of the dispersed phase 2000 kg/m3.

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