How does an airbag work?

I know that some sort of explosion occurs at some point but I don't know how it knows when to do explode or what sort of explosion it is.

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An airbag system consists of the airbag module which contains an inflator, the airbag itself, and a trim cover. The proper firing of the airbag is controlled by crash sensors which supply electrical signals to a control unit which fires the inflator to inflate the airbag.

In the 15 to 20 milliseconds after impact, the crash sensors and control unit determine the severity of the collision and establish whether to deploy the airbag.

At about 25 milliseconds, the airbag splits its covering pad surrounded by predetermined places and begins to inflate rapidly.

At nearly 45 milliseconds, the bag is fully inflated while the seatbelted occupant is still moving forward.

At around 60 milliseconds, the citizen contact the airbag which immediately begins to deflate via vent holes surrounded by the back.

Up to 100 milliseconds, the occupant continues to sink overpoweringly into the airbag which cushions the head and chest while it is deflating.

In smaller number than a blink of an eye, the crash has occurred, the airbag have deployed, done its job and now lies deflated within front of you.

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Answers:    A mixture sodium azide and potassium nitrate act in response after the igniter (small rocket booster) is triggered to produce hot nitrogen gas which is shot into a nylon bag at a rate of about 200mph which happen in about one-twenty-fifth of a second. It deflate quickly because of the two 2" or so holes at the base of the daypack.
An airbag system consists of the airbag module which contains an inflator, the airbag itself, and a trim cover. The proper firing of the airbag is controlled by crash sensors which supply electrical signals to a control unit which fires the inflator to inflate the airbag.

In the 15 to 20 milliseconds after impact, the crash sensors and control unit determine the severity of the collision and establish whether to deploy the airbag.

At about 25 milliseconds, the airbag splits its covering pad surrounded by predetermined places and begins to inflate rapidly.

At nearly 45 milliseconds, the bag is fully inflated while the seatbelted occupant is still moving forward.

At around 60 milliseconds, the citizen contact the airbag which immediately begins to deflate via vent holes surrounded by the back.

Up to 100 milliseconds, the occupant continues to sink overpoweringly into the airbag which cushions the head and chest while it is deflating.

In smaller number than a blink of an eye, the crash has occurred, the airbag have deployed, done its job and now lies deflated within front of you.

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