BARREL

A unit of volume equal to 42 U.S. gallons.

Barrel (bbl), a standard measure for oil and oil products. One barrel = 35 imperial gallons, 42 US gallons, or 159 litres.

In the petroleum industry, a barrel is 42 U.S. gallons. One barrel of oil has an energy content of 6 million British thermal units. It takes one barrel of oil to make enough gasoline to drive an average car from Los Angeles to San Francisco and back (at 18 miles per gallon over the 700-mile round trip).