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21. The time for the expiration of ethyl alcohol in the Ostwald viscometer is 15 s, and the time for the expiration of the same volume of water is 10 s. At T = 293 K, the water viscosity η = 1.005⋅10-3 Pa · s, its density ρB = 0.998 g / cm3, and the alcohol density ρc = 0.791 g / cm3. Find the coefficient of viscosity of alcohol η.
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Questions and problems from the manual:
"Laboratory Workshop on Colloid Chemistry" Nekrasov AP, Veretenchenko BA, Kharkov NTU "KhPI", 2004
"Characteristic properties of disperse systems" Nekrasov AP, Kharkov, 1996
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