It allowed students to see that, when one neglects all losses in an internal flow through a pipe, the results obtained with such an analysis are easier to get and they can be expected to predict the general trend to be followed by experimental flow rates well; but they overestimate flow rates by a very wide margin; hence, they cannot be relied upon to predict the magnitudes of the actual flow rates to be expected. However, when one includes all losses that can be reasonably accounted for, the required analysis is more complicated; but results so obtained not only predict the general trend well, they also yield magnitudes of volume flow rates that are much closer to those measured in the laboratory [4].