# cubic metre

##### SI coherent derived unit
Name Symbol Derived quantity
cubic metre m3 volume

### Definition

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

Volume is the quantity that expresses the size of a three-dimensional space.

### Capacity

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

### Usage

Abreviations, such as cu.m. and CU.M., must not be used in place of the SI symbol m3.