producer gas, fuel gas consisting chiefly of carbon monoxide and nitrogen. It is prepared in a furnace or generator in which air is forced upward through a burning fuel of coal or coke. Although the fuel is introduced through the top, no air is admitted there. The carbon of the fuel is oxidized by the oxygen of the air from below to form the carbon monoxide. The nitrogen of the air, being inert, passes through the fire without change. When steam is introduced with the air, the final gaseous product contains hydrogen also. Producer gas has a low heating value because it is about 60% inert nitrogen. It is widely used in industry because it can be made with cheap fuel. When producer gas contains hydrogen, it is also a source material for the manufacture of synthetic ammonia.

or capital goods or intermediate goods

Goods manufactured and used in further manufacturing, processing, or resale. Intermediate goods either become part of the final product or lose their distinct identity in the manufacturing stream, while capital goods are the plant, equipment, and inventories used to produce final products. The contribution of intermediate goods to a country's gross domestic product may be determined through the value-added method, which calculates the amount of value added to the final consumer good at each stage of production. This series of values is summed to estimate the total value of the final product.

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