An impeller is a type of rotating mechanical device used to increase the pressure and flow of fluids, while a rotor is a more general term for any rotating component of a machine, including an impeller. An impeller is often described as a "driven rotor" because it's powered to do work, typically moving fluids through a pump or fan. Therefore, an impeller is a specific kind of rotor designed to create pressure and flow, whereas a rotor is a broader term for a rotating part, such as a motor's rotor or an impeller itself.
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