What does Bag, air mean?

Bag, air meaning in Medical Dictionary

The airbag is a car safety device. Its restraining unit made to inflate rapidly during an automobile collision. It prevents the driver and traveler from striking the tyre or a window. The airbag was designed to just inflate in moderate to extreme front crashes. Airbags are usually designed with the intention of extra security of these currently restrained with a seatbelt. Most designs are filled through pyrotechnic means and can only be operated as soon as.