First of all, dont drink and drive, tell this to your friend also, for everyones safety.
The deployment of airbags has lot to do with the mechanism it uses to protect and heat plays a major role therefore its possible to get burns, this is how it works :
Sensor system
When the vehicle’s collision force reaches a certain level, caused by crashing at speeds of at least 15 to 30 kms per hour, the crash sensors activate the air bag’s inflation system. An accelerometer, built into a microchip, provides deceleration data to the sensor. A mass shift closes an electrical contact, which in turn flips a mechanical switch. A diagnostic module receives the electrical signal and, after testing to ensure there is a crash, allows the signal to trigger the inflation of the air bag. The diagnostic module also operates at other times, monitoring the air bag system’s readiness. When the driver turns on the vehicle’s ignition, for instance, the diagnostic module is activated and, if it detects a problem, it turns on a warning light to alert the driver.
Inflation system
In some inflation systems, sodium azide and potassium nitrate react to create nitrogen gas. Other systems create argon gas. The bag is then inflated with hot blasts of the gas. The system works somewhat like a solid rocket booster, as a solid propellant is ignited and its burning creates a large volume of gas very quickly. This process causes the air bag to burst out of its storage location at a speed between 160 and 350 kms per hour.
Most inflation systems are designed to deploy in a vehicle fire if the temperature rises to 150 to 205 C. This is a safety feature, as such high temperatures could otherwise cause the inflation system to explode within the air bag system. New systems are being developed to specify certain levels of inflation. Multi-stage inflators could deploy less forcefully in moderate collisions than in severe crashes. Also, occupant-sensing devices could tailor the deployment to a child or adult and his/her position.
Nylon bag
Air bags require engineered materials that can withstand high mechanical stresses and temperatures. During deployment, the internal pressure within the bag can rise as high as 100 kPa, while the temperature can reach 2,760 C. Some inflators also expel hot particulates that increase thermal loading to the system and could potentially cause burn-through.
Air bag nylon fibers are designed with energy absorption and thermal resistance properties to keep both pressure and heat within the bag. Nylon is also used for the casing for the air bag. When a driver-side air bag is fully inflated, it has approximately the diameter of a large ball. A passenger-side air bag, however, can inflate to twice or three times that size, since it needs to cover a greater distance (i.e. from the dashboard to the passenger).
Air bag manufacturers use either talcum powder or regular cornstarch to keep the bags lubricated and pliable during storage and deployment. This is why a powdery substance is released into the car’s interior upon air bag inflation. Small amounts of sodium hydroxide may be present, turning into sodium bicarbonate upon exposure to air. Potassium chloride is sometimes also present. Immediately after inflation, tiny ventilation holes in the bag allow the gas to dissipate rapidly. The bag deflates, allowing the driver or passenger to move once more.
The entire process of air bag inflation, driver or passenger contact and air bag deflation takes place in less than half a second
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