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QUESTION
Roughly estimate the number of collision per hour between silica particles 0.25 m is radius at a 0.1 volume fraction () in water.
Roughly estimate the number of collision per hour between silica particles 0.25 µm is radius at a 0.1 volume fraction (ϕ) in water. Assume that the silica density is 2 g/cm3, and the temperature is 300 K.
