Which of these is the heating element used to ignite the gas-generating material, usually sodium azide?

Name: Which of these is the heating element used to ignite the gas-generating material, usually sodium azide?
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Squibs are used as the heating element to ignite the gas-generating material, typically sodium azide, in devices such as airbags. They function by rapidly heating upon receiving an electrical signal, thus initiating the chemical reaction that generates the gas for inflation.

Which of These Is the Heating Element Used to Ignite