Pipes in your system will have a C-Factor to help determine this loss. This is a measure of the roughness of the interior of the pipe that creates this friction. Different types of piping will have a different C-Factor, and the higher the C-Factor, the smoother the pipe.
A motif is a literary term that is an idea, object, or concept that repeats itself throughout a text. A motif gives clues to theme or reinforces ideas an author wants to emphasize. A motif generally reinforces the theme of the text. A motif must be repeated throughout a text to be considered a motif.
A motif is a recurring symbol. It is a common literary device that helps to establish a theme or mood. Motifs can be almost anything: a repeated quote like in Fight Club, an object like in Lord of the Flies, or a theme like in The Wonderful Wizard of Oz. They are especially prevalent in fairy tales.