A typical rate of deposit of dust ( dustfall ) from
Chapter 1, Problem 74(choose chapter or problem)
A typical rate of deposit of dust ( dustfall ) from unpolluted air was reported as 10 tons per square mile per month. (a) Express this dustfall in milligrams per square meter per hour. (b) If the dust has an average density of how long would it take to accumulate a layer of dust 1 mm thick?
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