altfuel
Alternative fuels or "altfuels" are, specifically, alternatives to the common petrochemical-derived fuels - especially Gasoline, Diesel, JPn and the like.
Hydrogen
Hydrogen gas (H2) is a lighter-than-air gaseous fuel. The smallest molecule known to exist, H2 hydrogen gas passes right through many materials and is very difficult to contain. It has energy density somewhere between chemical batteries and typical fuels like gasoline or diesel fuel, but burns truly clean; the output of the combustion of hydrogen is heat and water. Hydrogen is difficult to store and work with, and expensive to produce; there are no natural deposits of hydrogen as there are of oil or natural gas.
Hydrogen-powered BMW
A hydrogen-driven BMW concept vehicle. BMW is frequently looking for new engine technologies and does a great deal of work with alternative fuels.
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