The cubic metre, symbol m3, is the SI coherent derived unit of volume. One cubic metre is equal to the volume of a cube with edges one metre in length.
Volume is the quantity that expresses the size of a three-dimensional space.
The internal volume of a container, especially one intended to hold a liquid, is often described as the container’s capacity.
The metric system makes no distinction between the terms capacity and volume – all three-dimensional spaces are measured with the same units.
Non-SI units of volume
The litre, symbol L or l, is a non-SI unit of volume, accepted for use with the SI. It is equal to one cubic decimetre, symbol dm3.
SI prefixes can be used with the litre; one microlitre is equal to one cubic millimetre, and one millilitre is equal to one cubic centimetre.
Orders of magnitude
|1000 mm3||= 1 cm3||= 1000 µL||= 1 mL||=||10-6 m3|
|1000 cm3||= 1 dm3||= 1000 mL||= 1 L||=||10-3 m3|
|1000 dm3||= 1 m3||= 1000 L||= 1 kL||=||100 m3|
|1000 m3||= 1 dam3||= 1000 kL||= 1 ML||=||103 m3|
|1000 dam3||= 1 hm3||= 1000 ML||= 1 GL||=||106 m3|
|1000 hm3||= 1 km3||= 1000 GL||= 1 TL||=||109 m3|
Abreviations, such as cu.m. and CU.M., must not be used in place of the SI symbol m3.