Nitrous oxide gas is a colorless, odorless, and non-toxic gas. It is also known as laughing gas because it can cause feelings of euphoria and laughter. Nitrous oxide gas is used as an anesthetic in dentistry and other medical procedures. It is also used to treat pain and anxiety. Nitrous oxide gas is also used in a variety of other applications, such as rocket engines, fire extinguishers, and as a propellant for aerosol products.