146. Задачка по химии №014 6016

13. Calculate the particle size of silicon dioxide if it is known that the time of their settling at a distance of 1 cm is: 1) 30 s; 2) 60 min; 3) 100 hours. The viscosity of the dispersion medium is η = 1.31 · 10 -3 Pa · s, the density of the dispersed phase and the dispersion medium is 2.7 and 1.1 g / cm 3, respectively,

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