Recall that we began this section by considering experiments to determine the pressure drop \Delta p associated with flow through a potentially rough circular pipe, which we expect to depend on several factors. The pressure drop may be affected, for example, by the diameter D of the pipe, the length L of the pipe, the roughness height e of the inner surface of the pipe, the viscosity \mu of the fluid, the density \rho of the fluid, and the mean velocity \overline{\nu } of the fluid. Use the Buckingham Pi Theorem to determine a set of dimensionless groups that can be used to design appropriate experiments and to correlate the associated data.