Liter (L)
The liter, symbol L, is a metric unit of volume equal to one cubic decimeter (dm³). First introduced in France in 1795, it became the standard for everyday liquid measurements. While technically not a SI base unit, the liter is accepted for use with the SI due to its practicality. One liter equals 1,000 milliliters and 0.001 cubic meters, and is used worldwide as a unit of volume. It is utilized in cooking, chemistry, and other applications where standard volume measurement is required.
US Gallon (gal)
The US gallon, denoted as gal, is a unit of volume that equals approximately 3.785 liters. It comes from old English wine gallons and became official in the US in the 1800s. People in the US still use it extensively for fuel, beverages, and cooking. The US gallon is smaller than the British one, which leads to different numbers in global trade and when comparing fuel use. Although most countries use metric units, the US gallon remains a significant part of US life.