The properties that are characteristic of hydrogen allow hydrogen to have many advantages over fossil fuels in terms of safety. Hydrogen's low density and ability to rapidly disperse allow hydrogen to escape to the atmosphere if a leak occurred. Propane and gasoline, with their high densities and slow dispersal allow the fuels to congregate near the ground increasing a risk of explosion. Hydrogen has to reach a concentration of 4% in the surrounding atmosphere before hydrogen poses a danger. Gasoline's concentration only has to reach 1% before the danger of ignition is apparent.
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PS I've always loved how the Newfies say 'car'.
posted by jimmythefish at 7:34 PM on August 24, 2006