 Unit of volume

A unit of volume is a reference for expressing a three-dimensional volume. In the International System of Units its coherent form is the cubic metre, ${\mathrm{m}}^3$. A litre is $10^{-3}{\mathrm{m}}^3$ and a millilitre is $10^{-6}{\mathrm{m}}^3$.

Length conversions must be cubed: because $1\mathrm{cm}=10^{-2}\mathrm{m}$, one cubic centimetre equals $10^{-6}{\mathrm{m}}^3$, rather than $10^{-2}{\mathrm{m}}^3$. This accounting matters when a measured mass and volume determine a mass density, or when a number density is converted between laboratory and SI conventions.^[ref]

The unit of volume is a measure used to quantify the three-dimensional space occupied by a substance or object. The most commonly used units of volume include: 1. **Cubic Meter (m³)**: The SI (International System of Units) unit of volume, equivalent to the volume of a cube with sides of one meter. 2. **Liter (L)**: A metric unit of volume, commonly used for liquids.