“How can vehicles be powered by Liquid Nitrogen Gas?”
Most cars these days are powered by petroleum. But there exists technology which allows for Natural Gas to be used. This works by holding Liquified Natural Gas (LNG) in a very cold (Between -140 and -130 degrees C) isolation chamber, pushing it out through a pressurized nozzle when desired, converting it to a gasified form, feeding it through a tank that changes the temperature and pressure to desired levels and then moving it into an Internal Combustion Engine. These are known as LNG Engines and may serve a transitory role before the mass advent of electric vehicles.