Fluid ounce
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A fluid ounce is a unit of volume typically used for measuring liquids. The British Imperial, the United States customary, and the United States food labeling fluid ounce are the three that are still
A baby bottle in both American and imperial fluid ounces
Gallon
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The gallon is a unit of volume in British imperial units and United States customary units.
Fluid ounce
…common use, although various definitions have been used throughout history. An imperial fluid ounce is 1⁄20 of an imperial pint, 1⁄160 of an imperial gallon, or exactly 28.4130625 mL. A US customary fluid ounce is 1⁄16 of a US liquid pint, 1⁄128 of a US gallon, or exactly 29.5735295625 mL, making it about…
A 1-US-gallon gasoline can showing "U.S. Gallon" marking (for American use), imperial gallons (for some Caribbean countries' and territories' use), and litres (for Canadian use)
A Shell petrol station selling 2* and 4* (leaded petrol) by the gallon in the UK, circa 1980
A fuel station in the United States displaying fuel prices per US gallon
A fuel station in St Vincent and the Grenadines displaying prices in Eastern Caribbean dollars per imperial gallon