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).
Cup (Imperial): is a unit of volume used in the imperial system, which was historically used in the United Kingdom and its former colonies. Though it has been largely replaced by the metric system in most of these countries, the imperial cup is still recognized and sometimes appears in older recipes and documents.
1 imperial cup = 284.131 milliliters (mL), which makes it larger than both the U.S. customary cup (236.588 mL) and the metric cup (250 mL).
1 imperial cup = 284.131 milliliters (mL), which makes it larger than both the U.S. customary cup (236.588 mL) and the metric cup (250 mL).
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