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Niether. Although it is possible to inflate an airbag with pneumatics, most car airbags are actually inflated by an explosive charge called sodium azide, which is even faster than pneumatics. Airbags only have a fraction of a second to inflate, which is why a sodium azide explosive charge is used.

Inflating an airbag hydraulically would be very bad - hydraulic fluid is incompressible, and thus can't absorb any crash energy. It would probably just burst even if you could inflate it quickly enough!

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Q: Does and air bag in an automobile use hydraulics and pneumatics?
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