Liter (L) - Unit Information & Conversion

Definition

The liter (symbol L or l) is a metric unit of volume. It is defined as exactly one cubic decimeter (1 dm³), which is equivalent to 1,000 cubic centimeters (cm³) or 0.001 cubic meters (m³). The liter is commonly used for measuring liquids and sometimes granulated solids.

History

The liter was introduced in France in 1795 as one of the new 'republican measures' and was defined as one cubic decimeter. The original symbol was 'l', but the symbol 'L' was adopted by the General Conference on Weights and Measures (CGPM) in 1979 to avoid confusion with the number '1'. While not an official SI unit (the SI unit for volume is the cubic meter), it is accepted for use with the SI.

Common Uses

• Beverages: Measuring beverages (water bottles, soda, milk cartons).
• Automotive: Engine displacement in vehicles.
• Containers: Volume of backpacks and containers.
• Laboratory: Laboratory measurements for liquids.
• Fuel: Fuel volume at gas stations in most countries.

Unit FAQs

Is a liter exactly 1 kilogram of water?

Approximately, yes, but not exactly. The original definition of the kilogram was based on the mass of one liter of water at its maximum density (around 4°C). However, the definition of the kilogram has since been refined based on fundamental physical constants. So, 1 liter of water has a mass very close to 1 kg under specific conditions, but it's not the definition.

What is the difference between L and l as symbols for liter?

Both are accepted symbols for the liter. 'L' was officially sanctioned to reduce ambiguity with the numeral '1', especially in print, but 'l' is still commonly used, particularly in scientific contexts where the font makes it distinct.

How does a liter relate to a cubic meter?

1 cubic meter (m³) is equal to 1,000 liters (L). Conversely, 1 liter is equal to 0.001 cubic meters.