Main Difference
The main difference between Impeller and Propeller is that the Impeller is a rotor used to increase (or decrease in case of turbines) the pressure and flow of a fluid or gas and Propeller is a fan that transmits rotational motion into thrust.
Impeller
An impeller (also written as impellor or impellar) is a rotor used to increase (or decrease in case of turbines) the pressure and flow of a fluid.
Propeller
A propeller is a type of fan that transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and a fluid (such as air or water) is accelerated behind the blade. Propeller dynamics, like those of aircraft wings, can be modelled by Bernoulli’s principle and Newton’s third law. Most marine propellers are screw propellers with fixed helical blades rotating around a horizontal (or nearly horizontal) axis or propeller shaft.
Impeller (noun)
Something which or someone who impels, usually a part of a pump.
Propeller (noun)
One who, or that which, propels.
Propeller (noun)
A mechanical device with evenly-shaped blades that turn on a shaft to push against air or water, especially one used to propel an aircraft or boat.
Propeller (noun)
A steamboat thus propelled; a screw steamer.
Impeller (noun)
the rotating part of a centrifugal pump, compressor, or other machine designed to move a fluid by rotation.
Impeller (noun)
a device turned by the flow of water past a ship’s hull, used to measure speed or distance travelled.
Propeller (noun)
a mechanical device for propelling a boat or aircraft, consisting of a revolving shaft with two or more broad, angled blades attached to it.