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A hydrometer test has the following results: $G_S=2\mathrm{.}6,$ temperature of water $=24C,$ and $R=40$ at $300$ minutes after the start of sedimentation $($see the figure below$).$

What is the diameter $D($in mm $)$ of the smallest$-$size particles that have settled beyond the zone of measurement at that time $($that is$,t=300$min $)?$

Your response differs from the correct answer by more than $100\%.mm$

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