Most experts agree that air bags represent a very important advance in automobile safety. These bags, which are stored in the auto´s steering wheel or dash, are designed inflate rapidly (within about 40 ms) in the event of a crash, cushion the front seat occupant vision and movement after the crash .Air bags are activated when a severe deceleration (an impact) causes against impact. The bags then deflate immediately to allow a steel ball to compress a spring and electrically ignite a detonator cap, which, in turn, causes sodium azide NaN3 to decompose explosively, forming sodium and nitrogen gas:
2 NaN3(s) → 2 Na (s) + 3 N2(g)
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