Question: A 0 . 1 2 - mm - diameter dust particle whose density is 2 . 1 g / cm 3 is observed to be

A 0.12-mm-diameter dust particle whose density is 2.1 g/cm3 is observed to be suspended in the air at 1 atm and 20C at a fixed point. Estimate the updraft velocity of air motion at that location. Assume Stokes law to be applicable. Is this a valid assumption? Answer: 0.90 m/s

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