In the case of the motor it is the rotor and the stator and for the pump it is the impeller and the volute (or diffuser). Of course the friction produced by bearings and other mechanical components (seals, stuffing box, etc) also affect pump efficiency, but the impeller and volute have the greatest influence. Lets start our investigation of centrifugal pump efficiency with the impeller.
The only difference between sport coats and blazers is that blazers are always solid-colored, usually blue, black, camel or dark green, while sport coats encompass about everything else. Blazers are considered more basic and more formal than sport coats. Photo Credit Jupiterimages/Brand X Pictures/Getty Images.
Key Difference â Ottoman vs Hassock. Both ottomans and hassocks are pieces of furniture that are categorised as footstools. They are padded, upholstered seats that have no back or arms. The key difference between ottoman and hassock lies in their size and shape; hassocks are often smaller than ottomans and are typically round in shape.