exothermal meaning in Hindi

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I notice his biography here has a section titled " Studies on nickel-hydrogen exothermal systems ".
He is describing this exothermal, extremely volatile reaction : 2K + 2H2O-> 2KOH + H2.
The reaction energy ( the " Q-value " ) is positive for exothermal reactions and negative for endothermal reactions.
In the early 90s Sergio Focardi, together with physicists Roberto Habel and Francesco Piantelli, started to develop a nickel-hydrogen exothermal reactor.
Upon ignition of the decoy flare, a strongly exothermal reaction is started, releasing infrared energy and visible smoke and flame, emission being dependent on the chemical nature of the payload used.
:" The Energy Catalyzer ( also called E-Cat ) is a cold fusion or Low-Energy Nuclear Reaction ( LENR ) heat source [ 1 ] [ 2 ] built by inventor Andrea Rossi [ 3 ] [ 4 ] with support from physicist Sergio Focardi . [ 5 ] [ 6 ] An Italian patent, which received a formal but not a technical examination, describes the apparatus as a " process and equipment to obtain exothermal reactions, in particular from nickel and hydrogen " . [ 7 ] [ 8]

adj.

(of a chemical reaction or compound) occurring or formed with the liberation of heat
synonyms：,