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A barrel is an English unit of measure for liquid volume which, in the oil and gas industry is equivalent to 42 liquid gallons when at standard temperature and pressure.  A barrel is abbreviated as bbl or bbls. 

Barrel Conversion Table
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  5.614583 cubic feet
  42 gallons
  9702 cubic inches
  158.987 liters
  0.158987 cubic meters
  5376 ounces, Fluid