A protective system in automobiles in which when a crash occurs, a bag containing nitrogen, formed by the explosive decomposition of sodium azide, quickly inflates in front of the driver or passenger, preventing injury to the head. Side air bags, including the back seat passengers, also prevent injury
A safety device, consisting of impact sensors, computer, a detonation device and air bag, that protects the driver (and in some cases, the passenger) in a crash by inflating a cushion hidden in the steering wheel and dashboard
air·bag airbags in AM and sometimes in BRIT, use air bag An airbag is a safety device in a car which automatically fills with air if the car crashes, and is designed to protect the people in the car when they are thrown forward in the crash. a bag in a car that fills with air to protect the driver or passenger in an accident