Assume a pipe diameter of one-half and commercial steel.compare a rough pipe referenced to a smooth pipe. This problem require you to use water however does it make a difference (values of ratios) if you were to use air as the fluid. Assume Re > 100,000 and use the friction factor equation. Continue studying the effects of roughness at the same Re number for a concrete pipe and copper pipe (use absolute roughness values). Calculate a pipe diameter for concrete and for copper that would result in a smooth tube assumption. In other word, if the diameter is large enough then the absolute roughness has no effect on pressure drop. As a starter, find the diameter that results in 100% error in pressure drop calculations for a smooth tube assumption.