Questions 158-160 refer to the following information.
| All of the air bags (specially in vehicles) work basically in the same manner. It has a sensor that can detect an abrupt reduction in speed and activate the device. The sensor is so precise that a regular driving condition, such as sudden slamming on the brakes at expressway speeds or colliding with another car while parking, will not activate it; however, a swift collision on the wall at a speed of at least twenty kilometers per hour is asked for making it work. A pulverized chemical, sodium azide, undergoes electrical combustion, and causes a rapid blast on nitrogen gas to blow up a big fabric bag. Nitrogen is a safe gas, and it makes up 78 percent of the air we breathe; sodium azide on the other hand can be poisonous and is therefore carefully secured inside a pressurized container until used. It only takes a second to inflate the bag, and then shrink again within several seconds. |
SHARE:
