What is volume?Volume is a measure of the amount of three-dimensional space occupied by an object. The volume of a container is generally understood to be the capacity of the container; i.e., the amount of fluid (gas or liquid) that the container could hold, rather than the amount of space the container itself displaces.
InputCubic Meter is the SI derived unit of volume. It is the volume of a cube with edges one meter in length.
Cubic Kilometer is the volume of a cube with edge length of one kilometer (1000 m), which is equal to one billion cubic meters.