liter
In the metric system, there is no difference between liquid capacity and capacity of anything else. The cubic meter is the unit for capacity, although for smaller capacities/volumes the liter which is 1/1000th of a cubic meter can be used.
a liter
It is a millilitre.
liter
Milliliter and liter
An example of a metric unit of capacity or volume is the liter. One liter is equivalent to 1,000 cubic centimeters and is commonly used to measure liquid volume.
-- milliliter -- liter -- cubic centimeter -- cubic meter
The answer is a millilitre.
The metric unit for volume (capacity is the volume something holds) is the liter which is the same volume as 1,000 cu cm. This can be preceded by the metric prefixes to form "other" units, for example the milliliter (ml) is 1/1000 liter (and the same size as 1 cu cm), the centilitre (cl) is 1/100 liter. Some metric units of capacity are Liters, and Milliliters. 2 liters is equal to a 2 liter soda from the store. 250 milliliters equals 1 metric cup.
A liter is the metric base unit for volume. The prefix "milli-," in this case, means "one-thousandth." So a milliliter is one-thousandth of a liter. Therefore, a liter is bigger.
A metric unit of capacity or volume that is equal to 1000 milliliters is called 1 liter.