3.10. Determine the specific surface area of barium sulfate powder (per unit mass) if its particles settle in an aqueous medium to a height of 0.226 m in 1350 s (assuming that the particles have a spherical shape). The density of barium sulfate and water is 4.5 and 1 g / cm3, respectively, and the viscosity of water is 1 * 10–3 Pa * s.
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