Barrel

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
Multiply	By	To Get
	5.614583	cubic feet
	42	gallons
	9702	cubic inches
	158.987	liters
	0.158987	cubic meters
	5376	ounces, Fluid