NOVELTY - A gas conversion apparatus (41) comprises a reaction chamber (43) including a cylindrical inner space and a discharge hole (67) in a lower portion, an electrode member (47, 71) including a lower end at the inner space of the chamber, a power source applying electricity for inducing plasma between an inner wall of the reaction chamber and the electrode member, a magnetic field generating unit (53) installed outside the reaction chamber, and a gas supplying unit (45).    USE - For converting gas, e.g. methane to acetylene, using gliding plasma.    ADVANTAGE - The induced gliding plasma is forced to swirl down in a circumferential direction of the electrode member to form a plasma region between the electrode member and the inner wall of the reaction chamber, so that the plasma region can be widely formed in the reaction chamber to increase gas conversion rate.    DETAILED DESCRIPTION - A gas conversion apparatus comprises a reaction chamber including a cylindrical inner space and a discharge hole in a lower portion; an electrode member installed on the reaction chamber and extended downward in a downwardly tapered shape, the electrode member including a lower end disposed at the inner space of the reaction chamber and insulated from the reaction chamber; a power source applying electricity to the reaction chamber and the electrode member for inducing plasma between an inner wall of the reaction chamber and the electrode member; a magnetic field generating unit installed outside the reaction chamber to rotate the plasma induced inside the reaction chamber in a circumferential direction of the electrode member for forming a plasma region; and a gas supplying unit supplying material gas into the reaction chamber to allow the material gas to pass through the plasma region for converting the material gas into a different gas by energy supplied from the plasma.    DESCRIPTION OF DRAWING(S) - The figure shows the gas conversion apparatus.    Gas conversion apparatus (41)    Reaction chamber (43)    Gas supplying unit (45)    Electrode member (47, 71)    Magnetic field generating unit (53)    Discharge hole (67)