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A new engine under development by Dearman Engine Company uses liquefied air for fuel, reports Discovery news. Instead of petroleum, cryogenic air is injected into ambient heat inside the engine, creating a high-pressure gas that drives the pistons and only emits cold air as exhaust. A proof-of-concept model has powered a car at more than 30 mph. DEC founder Toby Peters says, “You inject a heat-exchange fluid, such as anti-freeze and water, into the head of the piston just before you inject liquid nitrogen. The result is that all the expansion takes place inside the cylinder. And because you've got this volume of heat exchange fluid, it is isothermal expansion – so it keeps the temperature the same, which is far more efficient.”

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