The following data are reported for the flow of air through beds of granular activated carbon. Compare the pressure drops with values predicted using the Ergun equation, and predict the pressure drops for both sizes at air velocities of 100 and 200 ft/min.

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Va. ft/min 10 40 4 x 6 Mesh, Ap.in. H,0/ft 0.25 1.40 4 x 8 Mesh, Ap, in. H₂O/ft 0.32 1.80