8. Calculate the time during which spherical glass particles in water settle to a distance of 1 cm, if the dispersion of the particles is: a) 0.1 µm-1; b) 1 µm-1;
c) 10 µm-1. The density of the dispersed phase and the dispersion medium is 2.4 and 1.0 g/cm3, respectively. The viscosity of the dispersion medium is 110-3 Pas.

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