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 (Metric): in the metric system, the cup is not an officially standardized unit of volume, as the metric system primarily relies on liters and milliliters for volume measurements. However, the metric cup is commonly used in cooking and recipes in some metric-using countries as a convenient unit for measuring ingredients.
It is commonly abbreviated as "c" or "cup" and is equal 250 milliliters 0.25 litters. In some countries (i.e. Japan, The Netherlands) cup's volume is slightly different.
It is commonly abbreviated as "c" or "cup" and is equal 250 milliliters 0.25 litters. In some countries (i.e. Japan, The Netherlands) cup's volume is slightly different.
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