Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic meter. 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.
Any unit of length gives a corresponding unit of volume: the volume of a cube whose sides have the given length. For example, a cubic centimeter (cm3) is the volume of a cube whose sides are one centimeter (1 cm) in length.
In the International System of Units (SI), the standard unit of volume is the cubic meter (m3). The metric system also includes the liter (L) as a unit of volume, where one liter is the volume of a 10-centimeter cube. Thus 1 liter = (10 cm)3 = 1000 cubic centimeters = 0.001 cubic meters, so; 1 cubic meter = 1000 liters.
Small amounts of liquid are often measured in milliliters, where 1 milliliter = 0.001 liters = 1 cubic centimeter.