I assume you mean volume rather than capacity. The milliliter would be the best answer. It is 1 thousandth of a liter.
liters
The most appropriate metric unit measurement for the capacity of a paper cup is milliliters (mL) or cubic centimeters (cm³). These units are commonly used to measure the volume of liquids and solids in small containers like paper cups.
Centimeters or millimeters.
A centiliter is a unit of volume in the metric system equal to one hundredth of a liter. It is commonly used to measure small amounts of liquids, such as in cooking recipes or for pharmaceutical purposes.
A milliliter (mL) is a unit of volume in the metric system equal to one-thousandth of a liter. It is commonly used to measure small amounts of liquids such as medication or ingredients in recipes.
You can measure any small recipe amounts in ounces
The metric unit commonly used to measure the volume of juice in a small paper cup is milliliters (ml).
To measure small amounts.
A milliliter (mL) is a unit of capacity in the metric system equal to one-thousandth of a liter. It is commonly used to measure small liquid volumes, such as medications or ingredients in recipes.
Volume, usually liquids.
Milliliters.
something that s used to measure to small fractions of a millimetre. I can't believe you dont know a metric capliers