In 1979, American Terry Miller showed that it was possible for a car to run on compressed air alone. After developing his Air Car One, which he built for $1,500, Miller patented his method in 1983.
Instead of burning fuel to drive pistons with hot expanding gas, air cars used the expansion of compressed air to drive the pistons. Initially energy is involved in compressing the air, and this is usually done with electricity, but it is still a more environmentally friendly process than that of gasoline cars. Many companies are developing air cars, though they are yet to be released for the public; this is likely to happen in the very near future.
There are a few drawbacks that the air car must overcome before it hits the market big time. When air expands from its compressed state, the engine is cooled and this can encourage icing. Also, in
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