**The SI units for liquid volume are liter, with the symbol "L," and milliliter, which is abbreviated to "mL."** The International System of Units, commonly referred to as SI, is the modernized version of the metric system.

SI units are the standard units in most scientific calculations. Physical quantities, such as length, density, force, volume and mass, are denoted by a particular SI unit. Some of the base SI units include the meter for length, kilogram for mass and seconds for time.

Volume is a derived physical quantity. The volume of solid materials is measured in cubic meters (m^{3}), cubic decimeters (dm^{3}) or cubic centimeters (cm^{3}). The volume of liquids, also known as capacity, is commonly measured in liters, where 1 L = 1 dm^{3} and 1 mL = 1 cm^{3}.