The car's front collision sensors track unexpected acceleration and provide electrical impulses to turn on an initiator. The initiator's built-in tiny wire heats up and enters the propellant chamber. The chemical propellant inside the inflator undergoes a quick chemical reaction as a result. A pyrotechnic chain is a common term used to describe this phenomenon.
The Automotive Airbag gets filled with nitrogen gas as a result of this interaction. In less than a twentieth of a second, the airbag is inflated by this expanding gas. This causes the plastic module cover to unfold and inflate in front of the driver. Three tenths of a second after impact, the bag deflates after only one-tenth of a second of inflation. When the airbag is opened, talcum powder or cornstarch that has been applied to its inner side is released from the bag.
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