Airbags - "How it works...???"

  • It is a safety device used in car.
  • The goal of an airbag is to slow the passenger's forward motion as evenly as possible in a fraction of a second.
  • The bag itself is made of a thin, nylon fabric, which is folded into the steering wheel or dashboard or, more recently, the seat or door.
  • The sensor is the device that tells the bag to inflate.
  • Inflation happens when there is a collision force equal to running into a brick wall at 10 to 15 miles per hour (16 to 24 km per hour).
  • A mechanical switch is flipped when there is a mass shift that closes an electrical contact, telling the sensors that a crash has occurred.
  • The sensor receives information from a accelerometer built into a micro chip.
  • The airbag's inflation system reacts sodium azide (NaN3) with potassium nitrate (KNO3) to produce nitrogen gas.
  • Hot blasts of the nitrogen inflate the airbag.

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