Airbags

Diagram of airbag inflation

When the sensor attached to the airbag hidden in the steering wheel detects a collision force equal to running into a brick wall at 10 to 15 miles per hour, its sodium azide–containing inflator produces an electric spark that ignites the sodium azide. This causes a bunch of hot Nitrogen gas to be produced quickly. This fills the airbag and causes it to bust through the steering wheel.  In seconds the bag is already deflating by the holes in it in order to get out of your way. With the spark we see that the temperature and the Volume of the Airbag are directly related. As well as we see more moles on Nitrogen filling the bag to increase the volume to help cushion your impact. And that is how the gas laws help to make the airbag full so that it will help cushion the impact.

 http://www.howstuffworks.com/car-driving-safety/safety-regulatory-devices/question130.htm

http://www.lanl.gov/quarterly/q_sum03/airbags.shtml

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