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Air bags inflate when a sensor detects a front-end crash severe enough to trigger their deployment. The sensor sends an electric signal to start a chemical reaction that inflates the air bag with harmless nitrogen gas. All this happens faster than the blink of an eye.
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Air bags are safety devices in vehicles that rapidly inflate in the event of a strong front-end collision. A specific sensor within the vehicle detects the severity of the crash, and if it is deemed sufficiently intense, it triggers the deployment of the air bags. The sensor then sends an electric signal to initiate a chemical reaction that quickly fills the air bag with nitrogen gas, which is completely safe for passengers. This entire process occurs within an incredibly short span of time, faster than the human eye can even perceive.