Air bags have been made to save thousands of lives. If your car runs into something, your airbag can inflate in less than a tenth of a second and save you from a head on collision. The bag itself is made of thin nylon fabric that is folded into the steering wheel or dashboard. There’s also sensor that detects a collision force equal to running into a brick wall at 10-15 mph. Airbags are inflated by sodium azide (NaN3) and potassium nitrate (KNO3) quickly reacting to produce a large amount of hot nitrogen gas. When you get into a collision this gas inflates the bag and forces it out of the steering wheel or dashboard.