# 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.

## Input

**Milliliter**is defined as one-thousandth of a litre, and also often referred to by the SI derived unit "cubic centimeter".

## Output

**Imperial Gallon**is defined as exactly 4.54609 litres (277.4194 cubic inches). It is used in some Commonwealth countries.