What does FMC measure?

Prepare for the NWCG Introduction to Wildland Fire Behavior Calculations (S-390) Test. Study with interactive questions and explanations to ensure you're ready for the challenge.

Multiple Choice

What does FMC measure?

Explanation:
FMC, or Fuel Moisture Content, measures how wet fuels are as a percentage of their dry weight. In wildland fire behavior, FMC for live fuels indicates the moisture level at which those live fuels will no longer sustain combustion. When the fuel’s moisture is high enough, live fuels can’t ignite or carry a flame; as it dries, they become capable of burning and contributing to fire spread. The other statements don’t fit because ignition thresholds aren’t the same for all fuels—different fuels need different moisture levels to ignite. FMC isn’t an average of moisture across fuels, since moisture varies widely by fuel type and condition. It isn’t the rate at which moisture is lost, which would describe drying speed rather than the current moisture level.

FMC, or Fuel Moisture Content, measures how wet fuels are as a percentage of their dry weight. In wildland fire behavior, FMC for live fuels indicates the moisture level at which those live fuels will no longer sustain combustion. When the fuel’s moisture is high enough, live fuels can’t ignite or carry a flame; as it dries, they become capable of burning and contributing to fire spread. The other statements don’t fit because ignition thresholds aren’t the same for all fuels—different fuels need different moisture levels to ignite. FMC isn’t an average of moisture across fuels, since moisture varies widely by fuel type and condition. It isn’t the rate at which moisture is lost, which would describe drying speed rather than the current moisture level.

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