Nitrous oxide (N2O) is a colorless, odorless gas that is used as an anesthetic and analgesic.

High concentrations of Nitrous Oxide can cause a narcotic effect and may replace oxygen, causing death by asphyxia.

It is also used as a food aerosol in the preparation of whipping cream.

Nitrous oxide (laughing gas), is a commonly used sedative in dentistry and anesthetics, to increase suggestibility and imaginative ability.

At room temperature, N2O is quite un-reactive with most substances, including alkali metals, halogens, and even ozone. It is therefore widely used as a propellant in aerosol cans in place of the CFCs which can damage the ozone layer.