The litre is a unit of volume (or capacity as it is defined in science). The litre is not a unit in the International System of Units (SI), but is accepted for use with the SI. The SI unit of volume is the cubic metre (m3).
The abbreviation for litre (or litres) is “L”.
1 L = 0.001 m3
One litre is approximately the amount of liquid a thermos or a water bottle can hold.