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Peoples choice tourism awards Experience and Services Accommodation Terms and conditions. Popular items Home Rescue Home Rescue. Latest alerts Tips to stay safe online. Navigation Membership. Webinar series Educational videos Helpful articles Supporting resources Where to find help. Both frontal and side-impact air bags are generally designed to deploy in moderate to severe crashes and may deploy in even a minor crash.
Air bags reduce the chance that your upper body or head will strike the vehicle's interior during a crash. To avoid an air-bag-related injury , make sure you are properly seated and remember—air bags are designed to work with seat belts, not replace them. And children under 13 should sit in the back seat.
Vehicles can be equipped with both front and side air bags SABs. Frontal air bags have been standard equipment in all passenger cars since model year and in all SUVs, pickups and vans since model year SABs are being offered as standard or optional equipment on many new passenger vehicles.
Generally, when there is a moderate to severe crash, a signal is sent from the air bag system's electronic control unit to an inflator within the air bag module. Because air bags deploy very rapidly, serious or sometimes fatal injuries can occur if the driver or passenger is too close to — or comes in direct contact with — the air bag when it first begins to deploy.
Side-impact air bags inflate even more quickly since there is less space between the driver or passengers and the striking object, whether the interior of the vehicle, another vehicle, a tree, or a pole.
Sitting as far back from the steering wheel or dashboard as possible and using seat belts help prevent drivers and passengers from being "too close" to a deploying frontal air bag. This is why rear-facing car seats should not be placed in front of an active air bag, and children under 13 should be seated in the back seat. Air bags can only deploy once, so make sure you replace used air bags right away after a crash, only at an authorized repair center, and before you drive the vehicle again.
Takata air bags, installed in tens of millions of U. If your car or truck is included in this list of Takata air bag-affected vehicles , contact your dealer for the appropriate repair. You count on your air bag to protect you and others in your vehicle in the event of a crash. If your vehicle is equipped with a counterfeit air bag, there is cause for concern. Counterfeit air bags have been shown to consistently malfunction in ways that range from non-deployment to the expulsion of metal shrapnel during deployment.
NHTSA has identified certain vehicle makes and models that may have these air bags. We believe this issue affects less than 0. Consumers whose vehicles have been in a crash and who have replaced their air bags by a repair shop that is not part of a new car dealership within the past three years or who have purchased a replacement air bag online should contact the call center established by their auto manufacturer to have their vehicle inspected at their own expense and their air bag replaced if necessary.
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. The airbag and inflation system stored in the steering wheel. See more car safety images. If there was enough room in a car for a gas canister Whether the gas would remain contained at high pressure for the life of the car How the bag could be made to expand quickly and reliably at a variety of operating temperatures and without emitting an ear-splitting bang.
Cite This! Print Citation. Try Our Crossword Puzzle! What Is the Missing Number? That's not the only chemistry involved. Notice that the other chemical into which sodium azide falls apart is Na, or sodium.
Sodium is a very reactive metal that will react rapidly with water to form sodium hydroxide; as a result, it would be quite harmful if it got into your eyes, nose or mouth. So to minimize the danger of exposure, air bag manufacturers mix the sodium azide with other chemicals that will react with the sodium and, in turn, make less toxic compounds. What prompts an air bag to inflate by way of this reaction? There are sensors in the front of the automobile that detect a collision.
These sensors send an electric signal to the canister that contains the sodium azide and the electric signal detonates a small amount of an igniter compound. The heat from this ignition starts the decomposition of the sodium azide and the generation of nitrogen gas to fill the air bag.
What is particularly amazing is that from the time the sensor detects the collision to the time the air bag is fully inflated is only 30 milliseconds, or 0.
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