What are the units for E in the first fiber density formula?

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Multiple Choice

What are the units for E in the first fiber density formula?

Explanation:
The concept being tested is that density here is a count per area. In the first fiber density formula, E is defined as E = F / A, with F the number of fibers counted and A the sampling area. Since A is measured in square millimeters in this formula, the units of E come out as fibers per square millimeter. That’s why the correct unit is fibers per square millimeter. Fiber density is not expressed per volume here, so units like per liter or per cubic millimeter don’t apply. If the area were given in a different unit, the final units would scale accordingly (for example, fibers per square centimeter).

The concept being tested is that density here is a count per area. In the first fiber density formula, E is defined as E = F / A, with F the number of fibers counted and A the sampling area. Since A is measured in square millimeters in this formula, the units of E come out as fibers per square millimeter. That’s why the correct unit is fibers per square millimeter. Fiber density is not expressed per volume here, so units like per liter or per cubic millimeter don’t apply. If the area were given in a different unit, the final units would scale accordingly (for example, fibers per square centimeter).

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