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Nitrous oxide - the preferred go-fast gas of many speed freaks - delivers its substantial power boost by cooling the surrounding air, which in turn becomes denser. The denser air's higher oxygen volume feeds the hungry engine, which can now produce more power. Nitrous oxide is also widely used in the healthcare industry as an anesthetic and analgesic, so you'll find nitrous canisters in hospitals, dentists' offices and ambulance stations in addition to Paul Walker's local speed shop. British str