28. Calculate the particle size of silicon dioxide, if it is known that the time of their settling at a distance of 1 cm is:
a) 30 s;
b) 60 min;
c) 100 hours
The density of the dispersed phase and the dispersion medium are 2.2 and 1.1 g/cm3, respectively, the viscosity of the dispersion medium is η = 1.5*10-3 Pa*s.

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