In decreasing order:
cubic decimeter = liter
cubic centimeter = milliliter
cubic millimeter
liters
cups
fl oz is the capacity of a small paper cup
cubed (measure)3 ((Note a small 3))
The customary unit of capacity for a bathtub is gallons.
I assume you mean volume rather than capacity. The milliliter would be the best answer. It is 1 thousandth of a liter.
When purchasing a split mini AC unit for a small space, consider the cooling capacity, energy efficiency, noise level, size of the unit, and installation requirements.
Capacity isn't a unit at all. It's a characteristic, or a property of an item, which can be measured in whatever suitable unit. Capacity of batteries is measured in amp hours. Capacity of a gas tank can come in either liters or gallons.
Milliliters is the metric unit to use for the capacity of a thimble.
a cup is the best unit to measure the capacity of a small drinking glass
Capacity isn't a unit it is just a term that means how much a container holds. You can have metric units of capacity, such as Litres and Millilitres.
Metric