A hydrometer test has the following results: G_s = 2.6, temperature of water = 24°C, and R = 43 at 60 minutes after the start of sedimentation (see Figure 2.30). What is the diameter D of the smallest-size particles that have settled beyond the zone of measurement at that time (that is, t = 60 min)?

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FIGURE 2.30 Definition of L in hydrometer test