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barrel
A unit of volume used to measure liquids, particularly petroleum. For oil and petroleum products, a barrel equals 158.98 liters or 35 Imperial gallons (42 US gallons). For beer, a barrel equals 163.66 liters or 36 Imperial gallons (43.24 US gallons). For dry goods (such as grain), a barrel equals 0.1156 m3 or 3.180 bushels (3.28 US bushels).
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