What is the M3 (m³)

Every body in their childhood  at a primary school had learned what is M3 “m³” .  M3 is a expression for three meter times as 1 meter x 1 meter x 1 meter = 1 m³ . The cubic meter in English and international spelling as used by the International Bureau of Weights and Measures or cubic meter is the SI derived unit of volume. Its SI symbol is m. It is the volume of a cube with edges one meter in length. An alternative name, which allowed a different usage with metric prefixes, was the stère, still sometimes used for dry measure (for instance, in reference to wood). Another alternative name, no longer widely used, was the kilometer.

Dimension unit 

1 meter = 10 decimeter (dm) = 100 centimeter (cm) = 1000 millimeter (mm)

1 meter =  3.2 feet = 39 inch 

How to measure  a cargo’s cubic meter 

measure a cargo’s three bigger position’s length width heigh and times them together with unit meter.