You can measure and express any length or distance, no matter how large or small,
in terms of kilometers. But when it comes time to write the measurement down,
remember it, work with it, or tell others about it, it's often more convenient ...
especially when 'kilometer' results in a very small or a very large number ... to convert
the measurement to a smaller unit, such as the nanometer, or a larger unit, such as
the light year.
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You can use the kilometer to measure small distances, but it is inconvenient to do so. A kilometer is a unit of measurement for a large distance. It is more accurate and practical to measure small distances using smaller units like the meter or centimeter.
The kilogram is a measure of weight and the kilometer is a measure of distance
Ex. the distance between two cities A kilometer is 1,000 meters
A square kilometer is a square that measures 1 kilometer by 1 kilometer