Power device based on alkali-water reaction

Power device based on alkali-water reaction, having an exhaust nozzle (13) to exhaust the chemical reaction products generated in a cylindrical reaction chamber (1) with a siphon tube (12) connected to the exhaust nozzle (13) and an external pressure inlet (15) to transmit pressure to the interior of the reaction chamber (1). The device further has a water reservoir (2) to store water and transfer it to the reaction chamber (1) and an alkali reservoir (3) configured to store an alkali element and transfer it to the reaction chamber (1), and transfer means connecting the reaction chamber (1) to both reservoirs (2,3) to transmit the pressure generated in the reaction chamber (1) by means of part of the chemical reaction products to said reservoirs (2,3), providing the transfer of the water and the alkali element from both reservoirs (2,3) to the reaction chamber (1).