Barrel (US liquid): unit of volume traditionally used for measuring liquids abbreviated as "bbl". Its exact size depends on the context or substance being measured. In US most fluid barrels (apart from oil) are 31.5 US gallons (approximately 119 litters), but beer is 31 US gallons (117 litters).
Ounce (Imperial): unit of volume refers to the imperial fluid ounce, which is part of the imperial system of measurement. The imperial fluid ounce is slightly smaller than its U.S. counterpart and is equal to 28.413 milliliters.
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