That is optional. The best unit of measurment would probably be tons.
By:Donny Heitler
mass
Tons for a rough and ready answer, kilograms for a more accurate answer.
Meters
It is customary to use the kilogram - though that is technically not a weight, but a mass.
what is the most suitable unit to measure the length of a car key
Feet
kg. (kilograms), or tons (thousands of kg.).
eathier meters or feet
Gallons or liters.
You would measure the length of a car in metres. An average car is about 4m
You would measure the length of a car in metres. An average car is about 4m
litres