A nitrous oxide engine is an engine in which the oxygen required for burning the fuel stems from the decomposition of nitrous oxide (N₂O) rather than air. The system increases the internal combustion engine's power output by allowing fuel to be burned at a higher-than-normal rate, because of the higher partial pressure of oxygen injected into the fuel mixture.^[1] Nitrous injection systems may be "dry", where the nitrox oxide is injected separately from gasoline, or "wet" in which additional gasoline is carried into the engine along with the nitrous. Nitrous oxide systems may not be permitted for street or highway use, depending on local regulations