K5-13 Calculate size silica particles, if

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5.13 Calculate the size of the silica particles, it is known that the time of their settling at a distance of 1 cm is: 1) 30; 2) 60 min; 3) 100 h. The density of the dispersed phase and the dispersing medium are respectively 2.7 and 1.1 g / cm3, a dispersion medium viscosity η = 1,31 • 10-3 Pa • s

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Tasks of metodichek:
"Laboratory workshop on colloid chemistry" Nekrasov AP Veretenchenko BA, Kharkiv NTU "KPI", 2004
"Characteristic features of disperse systems" Nekrasov, AP, Kharkiv, 1996
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