Provide an example problem: If H = 2500 Btu/ft^2 and ROS = 0.5 ft/s, what is I?

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

Provide an example problem: If H = 2500 Btu/ft^2 and ROS = 0.5 ft/s, what is I?

Energy release along a fire front is found by multiplying the heat released per unit area by how fast the front moves. In this case, you take the heat per area, 2500 Btu/ft^2, and multiply by the rate of spread, 0.5 ft/s. Doing the math gives I = 2500 × 0.5 = 1250 Btu/ft·s. This matches the given result because the units combine to Btu per foot per second, which is the standard unit for fireline intensity. The other numbers would require changing either the heat per area or the spread rate, so they don’t fit with the provided values.

Provide an example problem: If H = 2500 Btu/ft^2 and ROS = 0.5 ft/s, what is I?

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.

Provide an example problem: If H = 2500 Btu/ft^2 and ROS = 0.5 ft/s, what is I?

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