Hydrogen (H2) at standard temperature and pressure is a colorless, odorless, non-metallic and flammable diatomic gas.
Hydrogen is the lightest and most abundant element in the universe. Hydrogen is present in water, in all organic mixtures and in all living organisms. Hydrogen is able to react chemically with almost all other elements. Hydrogen is used in the hydrogenation of fats and oils, in the production of Ammonia, in the petrochemical industry (hydro cracking), as a lever gas and also as a more recent alternative fuel, fuel cells.