Nitrous oxide "N2O" is a Non-Flammable, Non-explosive condensed form of air. It is an oxidizing element, which is a chemical compound that readily transfers oxygen. It is stored as a liquid but turns into a gas when introduced into the atmosphere. When injected into a motor, Nitrous Oxide expands and splits into both Nitrogen and Oxygen molecules. The Oxygen released is a denser concentration of Oxygen (33%) than can be found in the normal air (21%). This extra Oxygen allows for more fuel to be burned, thus increasing Horsepower.