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.
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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, . A litre is and a millilitre is .
Length conversions must be cubed: because , one cubic centimetre equals , rather than . 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]