Time
Millimetre.
a millimeter
meeters?
The meter.
You find a tape measure and take the measurement across the door, then the length of it, then if necessary the thickness.
Cm .
A kilometre.
Centimeters
Centimeters
Millimetre.
a millimeter
meeters?
Milligrams
Kilometres
Inches, millimetres or centimetres.
the metric system
The meter.