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The SI unit for linear measurement (length) is the meter. Different prefixes may be added to "meter" for multiples of 10's. For example, 1 meter = 100 centimeters= 1000 millimeters = 1000000 micrometers = 1000000000 nanometers. Or 1 kilometer = 1000 meters. In the United States, the imperial system is used for ordinary (non-science) purposes, which includes inches, feet, yards and the like.

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13y ago

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