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Thermal runaway in a lithium cell is dangerous because the reaction

  • A.generates heat that accelerates itself
  • B.consumes oxygen from the surrounding air
  • C.produces an inert gas that displaces air
  • D.requires an external heat source to continue

Answer: A

Above a threshold the internal reactions release heat faster than the cell can shed it, and the temperature climbs without limit until the cell vents or burns. It carries its own oxidant, which is why smothering the fire is ineffective.

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