The main thing Kilometers measure are long distances but this type of measurement is rarely used for anything else.
The sky
aeroplane. hello peopel
roads
more please
Bigger objects like celestial bodies ,Earth ,sun their radius are measured in kilometers .
Usually in kilometers. Larger objects, such as galaxies, may be measured in light-years, or in parsec.
Kilometers are units of one thousand meters, so they measure distance. Items that would be measured in kilometers are road lengths or air miles traveled.
Kilometers are more likely to be used to measure the distance between two places, rather than the size of objects, since in our normal experience, objects are more likely to be measured by meters or centimeters rather than by kilometers. However, the diameter of planets and their moons, or of the sun or stars, can be measured in kilometers.
your finger nail can be measured in millimeters
Speed is a rate often measured in kilometers per hour.
The density of an object is measured in kilograms and kilometers.
Objects composed of tiny amounts of mass.
Distance.
42,195km
24.31 kilometers = 2,431,000 centimeters
A 26.2-mile marathon is 42.16 kilometers.