Abstract: This invention is directed to a gaseous fuel containing water produced by a process, wherein a mixture gas of water, fuel and air is swirled with intense friction between them, contacted with metallic elements to receive thermoelectrons and activated at a temperature about 100.degree.-600.degree. C., as well as a process and apparatus for producing said fuel. When the gaseous fuel containing water by this invention is burned, the calorific value is greater than that of pure fuel combustion and the discharge of NO.sub.x and CO from the exhaust gas is small.

Abstract: The present invention is directed to a method of and an apparatus for producing mixture gases of three elements such as water vapor, fuel oil and air to be combusted in the combustion chamber of an internal combustion engine. The mixture elements, particularly water vapor, are heated so that they may be mixed in vapor phase while passing through passageways provided to absorb a heat generated in the combustion stroke of the engine. Under controlled combustion conditions, the mixture of these three elements may be fully combusted in the combustion chamber of the engine, whereby a large quantity of water may be applied to a fuel mixture as a substantial part thereof, thus resulting in a remarkable improvement in the fuel consumption or the output per unit of fuel oil in the internal combustion engine.