Volume unit corresponding to 159 liters A barrel of oil corresponds to about 0 137 metric tons
A round vessel or cask, of greater length than breadth, and bulging in the middle, made of staves bound with hoops, and having flat ends or heads
The quantity which constitutes a full barrel. This varies for different articles and also in different places for the same article, being regulated by custom or by law. A barrel of wine is 31 1/2 gallons; a barrel of flour is 196 pounds; of beer 31 gallons; of ale 32 gallons