Do you know how does a car Air-bag open?

There are sensors in the front of the vehicle that detect a collision. These sensors send an electric signal to the canister. The canister contains the sodium azide and the electric signal detonates a small amount of an ignite compound. The heat from this ignition starts the decomposition of the sodium azide and the generation of nitrogen gas to fill the air bag.

The sensor detects the collision and makes the air bag inflate in 0.03 second. After 0.05 seconds of accident, the car's occupant hits the air bag and its deflation absorbs the forward-moving energy of the occupant.

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