Most objects dimensions can be measured in km, from a pen right up to the width of a galaxy and beyond. the thing is that is gets a bit meaning less at the extremes, it become inappropriate to measure things in km. Anything less than one kilometer, and you start to use meters, millimeter's, nanometers etc.
Similarly, anything over a few million km on an astronomical scale, and you start to use astronomical units (AU) where one AU is the earth to sun distance. Bigger still, and you start to use lightyears, or even mega or gigalightyears (millions or billions of lightyears).
in general, anything between 1 and 150,000,000 km (1AU) is ok for using km.
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.
DistanceKilometers can be used to measure length or linear distance.Generally anything over 1,000 metres and less than an AU - eg Roads.
the distance from one city to the next
It is 981 miles = 1,579 km long.
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.
The main thing Kilometers measure are long distances but this type of measurement is rarely used for anything else.
Density of an object is measured in units of mass per unit volume, typically in g/cm3 or kg/m3. It represents how tightly packed the matter in the object is, with denser objects having more mass for a given volume compared to less dense objects.
your finger nail can be measured in millimeters
The term that refers to how far apart two objects or places are located is distance. Distance can be measured in various units such as meters, kilometers, miles, or light-years.
Distance.
42,195km
24.31 kilometers = 2,431,000 centimeters
A 26.2-mile marathon is 42.16 kilometers.