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Inflators are the devices which pump the gas into air bags to inflate them in a crash.
Single stage inflators. Single stage inflators fill air bags with the same level of power in all crashes, regardless of whether the crash is a relatively low or high speed crash.
Multi-stage inflators. Multi-stage inflators (also known as multi-level inflators) operate at different levels of power, depending on which stage is activated. The activation of the different stages can be linked to crash severity sensors. In a vehicle with dual-stage inflators, only the first stage (lowest level of power) will be activated in relatively low speed crashes, while the first and second stages (highest level of power) will be activated in higher speed crashes. As crash severity increases, so must the pressure inside the air bag in order to cushion the occupants.
national highway traffic association website
think they misunderstood too?



