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THORIUM TO HYDROGEN
Why Hydrogen? |
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| Hydrogen is the simplest and most common element in the universe—a colorless, odorless gas that accounts for 75% of the universe’s mass. It has the highest energy content per unit of weight—52,000 BTUs per pound (120.7 kilojoules per gram)—of any known fuel. Moreover, when cooled to a liquid state, this low-weight fuel takes up 1/700 as much space as it does in its gaseous state. This is one reason hydrogen is used as a fuel for rocket and spacecraft propulsion, which requires fuel that is low weight, compact, and has a high energy content. When burned with pure oxygen, the only byproducts are heat and water. When burned with air, which is about 78% nitrogen, some oxides of nitrogen are formed. Even then, burning hydrogen produces less air pollutants relative to fossil fuels.
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