A colorless liquid product of petroleum distillation that is used as a manufacturing solvent, a dry-cleaning fluid and a gasoline-blending stock.

National Petroleum Reserve

A petroleum province west of the Prudhoe Bay Field and south of Point Barrow on the North Slope of Alaska, consisting of millions of acres set aside and held in reserve for the purpose of national defense. Also called the Strategic Petroleum Reserve.

Natural Gas

A mixture of light hydrocarbons found naturally in the Earth's crust, often in association with oil (when it is known as associated gas). Methane is the most dominant component.

Natural Gas Liquids (NGL)

A mixed stream of ethane, propane, butane and pentanes that is split into individual components. These components are either sold or used as feedstocks for refineries and chemical plants.