Airbags operate in a very simple manner.
When an airbag sensor detects a collision, it automatically ignites a substance known as Sodium Azide held inside the vehicle. When this substance is ignited, it creates nitrogen gas, inflating the air bag.
This is related to the gas laws in the form of “Avagadro’s Law.” When nitrogen gas enters the bag, it essentially adds volume. The more particles, the greater the volume. Thus, the bag inflates.

Diagram of an airbag being activated

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