Barrel is equal to 42 U. S. Gallons. It serves as a volume standard for crude oil other petroleum products.
Barry Goldsmith
| APA | Barry Goldsmith. (2010). barrel. Retrieved September 23, 2026, from http://smartdefine.org/barrel/definitions/1148410 |
| Chicago | Barry Goldsmith. 2010. "barrel" http://smartdefine.org/barrel/definitions/1148410 (accessed September 23, 2026). |
| Harvard | Barry Goldsmith 2010, barrel, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/barrel/definitions/1148410>. |
| MLA | Barry Goldsmith. "barrel" 21 October 2010. Web. 23 September 2026. <http://smartdefine.org/barrel/definitions/1148410> |