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What does a flashback refer to in fire investigation?

  1. A delayed ignition of flammable vapors

  2. A sudden rekindling of flammable vapors

  3. Burning of debris after suppression

  4. Flame travel through an explosive device

The correct answer is: A sudden rekindling of flammable vapors

In the context of fire investigation, a flashback is characterized by a sudden rekindling of flammable vapors. This phenomenon occurs when flammable vapors that have accumulated in a space are ignited, causing the flames to travel back toward the source of the vapors. This can happen when a fire produces sufficient heat to ignite these vapors, catching fire unexpectedly and potentially creating a dangerous situation for investigators and firefighters. It's essential to recognize that flashbacks can complicate fire suppression efforts, as they can lead to unexpected flare-ups. Understanding the mechanics behind flashbacks is critical for fire investigators as it helps them analyze the fire's behavior, determine causes, and improve safety measures in the process of fire suppression and investigation.