Hydrogen-powered fuel cells hold enormous promise as a power source for future generations. Hydrogen is the simplest element known to humans. Each atom of hydrogen has only one proton. It is also the most abundant gas in the universe. Hydrogen has a unique property. It carries the highest energy content of any common fuel by weight (about three times more than gasoline), but interestingly it has the lowest energy content by volume (about four times less than gasoline). Hydrogen is the lightest element, and it is a gas at normal temperature and pressure. Hydrogen is not a widely used fuel today but it has great potential as an energy carrier in the future. Hydrogen can be produced from a variety of sources (water, fossil fuels, and biomass) and is a byproduct of other chemical processes.(www.alternative-energy-news.info/)
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