25 When calculating the number of selenium hydrosol par

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25 When calculating the number of selenium hydrosol particles at two levels, located at a distance of 100⋅10-6 m, 733 particles were found on the lower level, and 444 at the upper level. The density of selenium is 4.27 g / cm3; water density 1 g / cm3; Experimental temperature T = 292 K. Calculate the average particle diameter of selenium.

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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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