NOVELTY - Decomposing of water involves decomposing water molecules using electric energy to create cold water-dust by microwave atomization in vessel; introducing water-dust into a cavity resonator chamber (8) and exciting water-dust by electric microwave to create water stream of high speed molecules into a high voltage catalyst chamber; and decomposing molecules into hydrogen and oxygen ions that are introduced between accelerating electrodes.    USE - For decomposing water useful for producing hydrogen from water.    ADVANTAGE - The method is more effective and cheaper, and produces hydrogen gas faster by orders of magnitude than existing methods and apparatuses of the prior art. The method produces gas in a speed of fifty times higher than that of conventional hydrolysing methods.    DETAILED DESCRIPTION - Decomposing of water involves decomposing water molecules using electric energy to create cold water-dust by microwave atomization in vessel; introducing water-dust into a cavity resonator chamber (8) and exciting water-dust by electric microwave to create water stream of high speed molecules into a high voltage catalyst chamber; and decomposing molecules into hydrogen and oxygen ions that are introduced between accelerating electrodes. The electrodes are connected to poles of a controlled voltage source supplying direct current with alternate amplitude. The method further involves trapping hydrogen ions on cathode and oxygen ions on anode of voltage source. The microwave atomization takes place using piezoelectric crystals (3).    An INDEPENDENT CLAIM is also included for an apparatus for decomposing water comprising atomizing chamber, conduit, sources of ultrasound, cavity resonator chamber having at least magneton, filter arranged between the atomizing chamber and cavity resonator chamber, and second filter arranged between catalyst chamber and cavity resonator chamber, and electrodes placed in open bottomed gas collecting receivers.    DESCRIPTION OF DRAWING(S) - The figure shows an inner structure of the apparatus for decomposing water.    cylinder (2)    piezoelectric crystals (3)    baffle (7)    cavity resonator chamber (8)    catalyst chamber (12)    catalyst rod (15)    gas-issue openings. (19a, 19b)