demil3901 demil3901 Today at 11:02 AM Engineering Answered calculate the relative pipe roughness for a plastic pipe with absolute roughness 0.0025 mm and internal diameter of pipe is 0.157 inches. a. 6.26 x 10-4 m b. 0.0159 m c. 6.26 x 10-4 mm d. 0.6269 m