millimeter = unit of distance, not weight
kilometer = unit of distance, not weight
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A kilometer is heavier than a millimeter. A kilometer is a unit of length equal to 1,000 meters, while a millimeter is a unit of length equal to 1/1,000 of a meter.
A kilometer is bigger than a centimeter. There are 100,000 centimeters in a kilometer.
There are 1000 meters in a kilometer.
A mile is longer than a kilometer. One mile is approximately 1.609 kilometers.
a meter a thousand times shorter than a kilometer or, there are 1000 metres in a kilometer
There are 1,000,000,000,000 nanometers in a kilometer.