If H = 3000 Btu/ft^2 and ROS = 60 ft/min, what is I in Btu/ft·s?

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

If H = 3000 Btu/ft^2 and ROS = 60 ft/min, what is I in Btu/ft·s?

The quantity I is obtained by combining heat released per unit area with how fast the fire front is moving, then converting to per-second units. Multiply H by the rate of spread and convert minutes to seconds: I = H × ROS ÷ 60.

Plugging in the numbers: I = 3000 Btu/ft^2 × 60 ft/min ÷ 60 = 3000 Btu/ft·s.

You can also see this by converting ROS to feet per second: 60 ft/min equals 1 ft/s, so I = 3000 × 1 = 3000 Btu/ft·s.

So the result is 3000 Btu/ft·s.

If H = 3000 Btu/ft^2 and ROS = 60 ft/min, what is I in Btu/ft·s?

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.

If H = 3000 Btu/ft^2 and ROS = 60 ft/min, what is I in Btu/ft·s?

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