Barrel

A barrel is a unit of measurement commonly used in the logistics and supply chain industry, particularly in the oil and gas sector. It refers to a standardized volume measurement for commodities such as crude oil, petroleum products, and other liquid or bulk goods.  

The specific size of a barrel may vary depending on the commodity and the region, but the most common reference is the oil barrel, which typically represents 42 US gallons or approximately 159 liters. Barrels are used as a standard unit for pricing, trading, and transportation calculations in the industry.