It is colourless, odourless gas, burns and forms explosive mixtures in air. Reacts violently with oxidants. Hydrogen is the most abundant element in the universe. 0.53 ppm 2. In lab work from reaction of metals with acid solutions or electrolysis.
Most hydrogen is used in the production of ammonia and in metal refining.
Also used as fuel in rockets. If you have comments, correction or suggestions about this site, please send me an e-mail .