Definitions, Sources and Explanatory Notes

 Category:   Petroleum Refining & Processing
 Topic:   Natural Gas Used as Feedstock for Hydrogen Production


Key Terms Definition
Hydrogen The lightest of all gases, occurring chiefly in combination with oxygen in water; exists also in acids, bases, alcohols, petroleum, and other hydrocarbons.
Natural Gas A gaseous mixture of hydrocarbon compounds, the primary one being methane.
Petroleum Administration for Defense (PAD) Districts Geographic aggregations of the 50 States and the District of Columbia into five districts by the Petroleum Administration for Defense in 1950. These districts were originally defined during World War II for purposes of administering oil allocation. Description and maps of PAD Districts and Refining Districts.

For definitions of related energy terms, refer to the EIA Energy Glossary.


  • Energy Information Administration, Form EIA-820, "Annual Refinery Report".
  • EIA Forms & Instructions .
  • Background, Survey Methodology and Statistical Details .

  •   Explanatory Notes

  • Totals may not equal sum of components due to independent rounding.