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.
2. motif-a theme that is repeated or elaborated in a piece of music. motive. melodic theme, musical theme, theme, idea - (music) melodic subject of a musical composition; the theme is announced in the first measures; the accompanist picked up the idea and elaborated it.