NOVELTY - Gas production apparatus for increasing a specific density and an energy content of a gas has a mechanism to fill up a pressure resistant piping system with a gas, pair(s) of electrodes, an electric power delivery unit, a gas recirculating unit, and gas collector. The resulting processed gas has greater specific density and energy content than a gas originally filled into the piping system.    USE - The apparatus is used for producing a gas or for increasing a specific density and an energy content of a gas, e.g. hydrogen, a non-combustible gas, oxygen, a gaseous hydrocarbon fuel, or a liquid vapor (claimed). It is particularly used for producing hydrogen gas which is useful as a primary alternative fuel for the large scale replacement of gasoline and other fossil fuels via its use as automotive fuel or in fuel cells.    ADVANTAGE - The inventive apparatus is capable of producing new forms of hydrogen and oxygen with magnecular structure with increase in voltage, power, and efficiency of fuel cells; and for producing hydrogen, oxygen, and other gases with large multiple value of their standard specific density, and consequential increase of their energy content per cubic foot.    DETAILED DESCRIPTION - Gas production apparatus for increasing a specific density and an energy content of a gas comprises a pressure resistant piping system (5) equipped with on-off pressure valves (6-9), a mechanism to fill up the piping system with a gas and mechanism for compressing the gas to a desired pressure, at least one pair of electrodes (1-4) placed within the piping system and capable of delivering an electric arc (20) within an interior of the piping system, an electric power delivery unit to deliver an electric power to each electrode, a gas recirculating unit to recirculate the gas through the electric arc, and a gas collector to collect a resultant processed gas. The resulting processed gas has greater specific density and energy content than a gas originally filled into the piping system.    INDEPENDENT CLAIMS are also included for:    (a) a method of increasing the voltage, power, and efficiency of a fuel cell, which comprises operating the fuel cell with a processed gas which has a specific density and an energy content bigger than corresponding values of an original gas prior to being processed; and    (b) a method of operating an internal combustion engine with a decreased need for atmospheric oxygen, which comprises operating the engine with a processed fuel made from a processed hydrogen gas having a specific density and energy content greater than a corresponding value for conventional hydrogen gas.    DESCRIPTION OF DRAWING(S) - The figure depicts an application of the invention.    Electrodes (1-4)    Piping system (5)    On-off pressure valves (6-9)    Electric arc (20)