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Why units that doesn belong to the International System of Units are used?

April 26, 2017International system units Used

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Why units that doesn belong to the International System of Units are used?

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The units of the International System are useful for calculations and normalization. However, in technical environments other units are used for convenience. Diameters of small components are given in millimeters (mm) and speed in revolutions per minute (rpm). The power developed by the motor is sometimes expressed in horsepower (hp).