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The resistance of a section of roadway in which there is a pressure of 1 lb/ft2 (6.9 kPa) throughout the section, when an amount of 1,000 ft3 /s (1 kilocusec or 28.3 m3 /s) of dry air at 60 degrees F (15.6 degrees C) and 30 in (762 mm) barometer is passing. See also: Atkinson's friction coefficient
Source: Dictionary of Mining, Mineral, and Related Terms

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