NOVELTY - A biomass and/or organic material is converted to useful energy gases by supplying dried and pre-heated of biomass particles into reactor (10); and subjecting biomass particles in the reactor to a stream of superheated steam at 300-1700 degrees C for pyrolyzing biomass and steam to produce energy gases comprising hydrogen and/or carbon monoxide.    USE - For converting biomass and/or organic material (comprising fibrous plant material, carbon waste products and organic chemicals including any toxic compounds such as chlorinated organics and polychlorinated biphenyl) into fuel gas used for liquid fuel generation; and mineral ash comprising salt or hydroxide of potassium used as fertilizer (claimed).    ADVANTAGE - The method has high conversion efficiency.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the pyrolytic reactor (10) comprising:    (A) a tubular envelope;    (B) a rotor (14) which is disposed axially within the envelope; supplying mechanism for introducing the biomass particle into reaction zone;    (C) first annular space which surrounds envelope and includes a water injection port for receiving water to be converted into superheated steam and at least one steam port leading to the reaction zone within the envelope;    (D) a first annular susceptor which is provided in an evacuated space and in thermal contact with the reaction zone;    (E) a second annular space which surrounds envelope and includes at least one port to admit from reaction zone superheated steam and product gases, and product gas outlet port;    (F) a second annular susceptor which is provided in an evacuated space in thermal contact with the reaction zone;    (G) an inductor coil which is disposed outside tubular wall and aligned with the first and second susceptors; and    (H) power supply unit (54) for applying controlled radio frequency current to inductor coil.    DESCRIPTION OF DRAWING(S) - The drawing is schematic diagram showing a biomass flash hydropyrolysis system.    Pyrolytic reactor (10)    Rotor (14)    Hopper (50)    Power supply unit (54)    Optical pyrometer control (60)