A millimetre exists to measure distance. This distance is of a particular size where it wouldn't make sense to measure it in kilometres (too small) such as the tip of a pencil's width.
The metric unit for 1 millimeter is meters. 1 millimeter is equal to 0.001 meters.
Millimeter is the smallest unit among centimeter, kilometer, millimeter, and meter.
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what is 1.9 meters to a millimeter
flys are a millimeter long
a millimeter is the length of a millimeter
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It is a millimeter