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).
Teaspoon (Metric): in the metric system, the teaspoon is not a standardized unit of volume. The metric system primarily uses the liter and its subunits, such as milliliters, for measuring volume. However, in culinary contexts, especially in recipes, people might refer to a "teaspoon" for convenience, as 1 metric teaspoon is often considered to be roughly equivalent to 5 milliliters.
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