Liter
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Litre (symbol L or l) is only an accepted unit in SI.
The official unit for volume in SI is the cubic metre (m3).
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A litre is a metric unit of volume.
If, by 'metric system', you mean the 'SI system', then there is no base unit for volume. The unit for volume is called a 'derived unit', and it is the cubic metre (m3).
The unit of liquid volume in the metric system is the liter (L).
A metric unit of measure for volume, often liquids.
The basic metric unit of volume is the liter (L).