It depends on the amount. Very little: mm3 Drinking Glass: cm3 Pools: m3 Oceans: km3
a time watch in seconds
gallons
water in millagrams
Feet.
a centimeter
A shoe.
You would use CM or INCHES to measure a knife
what unit of measure is thickness og a ballpen
Ounces or milliliters.
A kilometre.
Kilometers
meters