Hydrogen, or H2, is the lightest of all gases. Commonly found in nature in compounds with other elements, it is the most abundant element in the universe. Hydrogen is a component of water, minerals and acids, as well as an essential part of all hydrocarbons and essentially all other organic substances. In fact, 98 percent of the known universe - most notably the sun and stars - consists of hydrogen.Colorless, odorless, tasteless and nontoxic, hydrogen exists as a gas at atmospheric temperatures and pressures. A stable molecule because of its high bond strength, hydrogen becomes reactive at elevated temperatures or with the aid of catalysts. When cooled to its boiling point of -423F (-253C), hydrogen becomes a liquid that is approximately 93 percent lighter than water. All other gases - except helium - become solids at this temperature.
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Last Updated : 03/16/2013