How does the car's airbag work?
Ans: An airbag is something which helps safety of driver & passengers in the event of an accident. In the event of an accident, the airbags open automatically within fraction of a second and cover the body of personnel inside.
How does an Airbag works-
An airbag is more correctly known as a Supplementary* Restraint System (SRS) or Supplementary Inflatable Restraint (SIR).
There are three parts to an air bag. First, there is the bag itself, which is made of thin, nylon fabric and folded into the steering wheel or the dash board. Then there is the sensor that tells the bag to inflate. It detects a collision and auto-activates the system.
Finally, there is the inflation system. Air bags are actually inflated by the equivalent of a solid rocket booster. Sodium Azide (NaN3) and potassium nitrate (KNO3) react very quickly to produce a large pulse of hot nitrogen gas. This gas inflates the bag, which literally bursts out of the steering wheel or dashboard as it expands. About a second later, the bag is already deflating (it has holes in it) in order to get out of your way.
*The word "supplementary" here means that the airbag is designed to help the seatbelts protect you rather than replace them (relying on an airbag to protect you without fastening your seatbelt is extremely dangerous).
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