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In page Vehicle:
"Compressed gas motors have been used on some vehicles experimentally. They are simple, efficient, safe, cheap, reliable and operate in a variety of conditions. One of the difficulties met when using gas motors is the cooling effect of expanding gas. These engines are limited by how quickly they absorb heat from their surroundings.[9] The cooling effect can, however, double as air conditioning. Compressed gas motors also lose effectiveness with falling gas pressure.[citation needed]
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