per day (bpd) Production of crude oil and petroleum products is frequently measured in barrels per day. A barrel is a volume measure of forty- two United States gallons. Conversion of barrels to tons depends on the density of the special product. About 7.3 barrels of average crude oil weigh one ton. Heavy products would be about seven barrels per ton. Light products, such as gasoline and kerosene, would average close to eight barrels per ton.

Casks containing 180 litres (47 am. gallons)

As in, "I have ten barrels at $20 a game". A barrel is how much money per game a player is betting.

Volume measurement of liquid in the petroleum industry. Equal to 42 U.S. gallons or 35 Imperial gallons or about 0.136 tonnes depending on specific gravity which can range from 7.1 to 7.8 barrels per tonne.