Volume is the quantity of three-dimensional space enclosed by some closed boundary, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains.
For the imperial system the standard unit of volume is the cubic foot, or cubic inch. Other common units include Gallons, quarts, pints, cups, fluid ounces, tablespoons and teaspoons.
Volume is often quantified numerically using liters (L) as a unit of volume, where one liter is the volume of a 10-centimetre cube. More commonly used in the metric system is the mililiter where 1000 mililiters equal 1 liter.