In the equation I = H × R, what are the units of H?

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

In the equation I = H × R, what are the units of H?

Think about dimensional consistency in a product. I has units of energy per area (Btu per square foot). If R is a pure number (a dimensionless factor), then the units on the right must come solely from H. To match I’s units, H must also carry energy per area with no extra time or area factors. That means H has units of Btu per square foot. If H carried any time unit, R would have to carry a matching inverse time to still end up with Btu/ft^2, which isn’t indicated here. So the only consistent choice is Btu per square foot.

In the equation I = H × R, what are the units of H?

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.

In the equation I = H × R, what are the units of H?

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