One litre is the volume of a

cube with 10 cm sides.

Unit Information
It is a unit of Volume
Symbol L or l
Unit System SI derived unit
In base units 1 L = 10-3 m3

Litre(L) (or Liter) is one of the common units of measuring volume of a substance. It is not defined as the SI unit by the International Bureau of Weights and Measures. 1 Litre is equal to 1 dm3. A cubic decimetre (or litre) occupies a volume of 10×10×10 centimetres (see figure) and is thus equal to one-thousandth of a cubic metre. 

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