Sodium azide is a chemical compound with the formula NaN₃. It appears as a white, crystalline solid and is primarily used as a preservative in laboratories and as a propellant in automotive airbags. Sodium azide is known for its ability to release nitrogen gas rapidly when it decomposes, making it useful in various applications. However, sodium azide is highly toxic and can be dangerous if ingested or inhaled. It can cause serious health effects, including respiratory issues and cardiovascular problems. Proper safety measures are essential when handling this compound to prevent accidental exposure.