You have to understand the complete working of an air bag
before you can ask this question. The most important units of an air bag system are: an
air bag and gas generator, crash sensors and a diagnostic monitoring
unit.
In case of a collision, which is taken to be the car
hitting a barrier at 14.48 km/hr, the crash sensors detect the deceleration and send an
electric current through an initiator. The initiator leads to a solid propellant
undergoing a rapid production of a gas, usually nitrogen, which fills up the airbag in
less than 1/20th of a second. The bag remains inflated for 1/10th of a second and then
gets deflated which takes around 3/10th of a second.
This
is a very essential part of the operation of the airbag mechanism. As you may guess,
just an inflated bag is going to cause a lot of harm if you crash into it, just like you
will injure yourself if you fall from a height even on something soft. The fact that the
air bag inflates and then deflates after a very short duration of time allows it to
absorb the energy of the impact and protects you in case of an
impact.
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