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CFM, standing for Cubic Feet per Minute, is a measurement of the amount of a material (usually a gas or liquid), measured in cubic feet, that passes through a given spot over the interval of one minute.

RPM, standing for Rotations per Minute, is a measurement of the number of full rotations (360 degrees) that something makes over the interval of one minute.

The difference between the two is that one is a measurement of Volume vs. Time whereas the other is Rotation Distance vs. Time.

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