N20 is a chemical compound, also known as nitrous oxide, laughing gas, nitro, or nos. It is a colorless gas that is commonly used for sedation and pain relief in medicine, but it is also used recreationally by people to feel intoxicated or high. Nitrous oxide is classified as a dissociative anaesthetic and has been found to produce dissociation of the mind from the body, distorted perceptions, and in rare cases, visual hallucinations. Nitrous oxide is also used in a monopropellant rocket, where it decomposes exothermically into nitrogen and oxygen in the presence of a heated catalyst. Nitrous oxide is not flammable, but it will support combustion to the same extent as oxygen. It is a weak anesthetic inhalational agent but has good analgesic effects. Nitrous oxide depresses all sensations, including hearing, touch, and pain, and it appears to prevent some of the emotional centers in the brain from functioning normally.