The milliliter (mL) is a metric unit of volume equal to one-thousandth of a liter, widely used in medicine, cooking, and chemistry for measuring small liquid quantities. Cough syrup dosages, perfume bottles, and laboratory reagents are all commonly labeled in milliliters. One milliliter equals exactly one cubic centimeter, making it interchangeable with cm³ in scientific contexts.

The UK gallon (imperial gallon) equals exactly 4.54609 liters, about 20% larger than the US gallon, and remains the standard fuel measurement in the United Kingdom and some Commonwealth nations. British fuel efficiency is expressed in miles per imperial gallon, which yields higher numbers than the US equivalent. One UK gallon equals approximately 1.201 US gallons.