You could use cm, meters (eg. 0.18cm ) or millimetres . A mix of cm and mm should be best for accuracy .
Kilometres
Metric system: meters; customary system: feet
Length, width and height are all measurements of distance. Distance is measured in meters (metric system) or inches/feet/miles (imperial system).
Yards if you work in imperial units or metres if you work in metric units
You could measure with Kilometers, Deckameters,hectometers,meters,decimeters,centimeters,millimeters, or micrometers. To give you an idea, one centimeter is equal to 2.54 inches. There are about three feet in one meter.
the answer is ? it is so unknown
the metric system
cm
mm
Width is a length or distance. The unit of length is the meter.
Volume is measure as width times height by depth no matter the system you're using. The metric system would just define the type of measurement you would use, such as liters instead of gallons.
centimetre
A millimetre.
It would be millimetres.
Kilometres
Metres, to measure its length or width, square metres to measure its area.
A metric ruler measures in inches and centimeters.