Hydrogen - Wikipedia
Hydrogen is a chemical element; it has the symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter.
Hydrogen | Properties, Uses, & Facts | Britannica
The earliest known chemical property of hydrogen is that it burns with oxygen to form water; indeed, the name hydrogen is derived from Greek words meaning ‘maker of water.’
Hydrogen explained - U.S. Energy Information Administration (EIA)
Hydrogen occurs naturally on earth in compound form with other elements in liquids, gases, or solids. Hydrogen combined with oxygen is water (H 2 O). Hydrogen combined with carbon forms different compounds—or hydrocarbons—that are found in natural gas, coal, and petroleum.
Hydrogen - Department of Energy
Hydrogen has been described as the “Swiss army knife” of energy because it plays a key role in several sectors where there are limited or no viable alternatives (including in applications where electrification is particularly challenging or costly).
Hydrogen Energy Explained: Everything You Should Know
This article, brought to you by the Renewable Energy Institute, an accredited provider of renewable energy education and training, provides an accessible overview of hydrogen; how it works, its advantages and challenges and the technologies shaping its future.
Hydrogen - Fuel, Energy, Uses | Britannica
One method for determining the total hydrogen content of a substance is to oxidize the substance completely in a stream of pure oxygen, which reacts with the hydrogen to produce water vapour.