Analogous to a shaykhdom and, if an independent state, to a kingdom. 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 specific product. About 7.3 barrels of average crude oil weigh one ton.
Heavy crude is about seven barrels per ton.
Light products, such as gasoline and kerosene, average close to eight barrels per ton. The oil industry views the production, processing, transportation, and sale of petroleum products as a flow process starting at the wellhead. Downstream includes any stage between the point of reference and the sale of products to the consumer. A value measure of the flow of domestic goods and services produced by an economy over a period of time, such as one year. Only output values of goods for final consumption and investment are included because the values of primary and intermediate production are assumed to be included in final prices.