What are the four classes of fires based on?

The fuel involved.

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  1. The fuel involved ✔
  2. The color of flames
  3. The time of day

Why: Fire classes group fires by the type of fuel burning, which guides which extinguisher to use.

Huh, didn't know that: Fire classes group fires by the type of fuel burning, which guides which extinguisher to use.

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References

Answer: The fuel involved. Fire classes group fires by the type of fuel burning, which guides which extinguisher to use.

  1. Scouting America: Chemistry www.scouting.org/merit-badges/chemistry
    Describe the four classes of fires, and the four classes of fire extinguishers
    Checked 2026-11-07.

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