131.Solving a chemistry problem
20. Calculate the time for which the spherical particles Al 2 O 3, distributed in a medium with a viscosity of 1.31 · 10-3 Pa · s, settle at h = 5 cm, if the specific
the particle surface is: a) 10 4 m -1; b) 10 5 m -1; c) 10 6 m -1. Densities of the dispersed phase and the dispersion medium are 4 and 1 g / cm 3, respectively.
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