Any object with a mass can be measured with kilograms. So, if you want to find the mass of something, you can use kilograms. Or grams if it is small.
0.5 killograms
your finger nail can be measured in millimeters
Bigger objects like celestial bodies ,Earth ,sun their radius are measured in kilometers .
Objects composed of tiny amounts of mass.
Usually in kilometers. Larger objects, such as galaxies, may be measured in light-years, or in parsec.
Objects having very small thickness.
The height of a hill.
When you have calculated or measured it.
Anything physical can be measured in cm.
The answer would be different
The answer would be different
in kg for larger, heavier objects, but g for smaller lighter objects