In the lift equation, which term represents air density?

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Multiple Choice

In the lift equation, which term represents air density?

Explanation:
Air density is the part of the lift equation captured by the symbol ρ. Lift scales with dynamic pressure, which is 1/2 ρ V^2, so higher density means more air molecules push on the wing per unit time, increasing lift for the same speed, wing area, and lift coefficient. The other factors—V is the speed through the air, S is the wing area, and Cl is the lift coefficient that depends on the wing’s shape and angle of attack—affect lift in separate ways, but they don’t represent density. So the term that represents air density is ρ.

Air density is the part of the lift equation captured by the symbol ρ. Lift scales with dynamic pressure, which is 1/2 ρ V^2, so higher density means more air molecules push on the wing per unit time, increasing lift for the same speed, wing area, and lift coefficient. The other factors—V is the speed through the air, S is the wing area, and Cl is the lift coefficient that depends on the wing’s shape and angle of attack—affect lift in separate ways, but they don’t represent density. So the term that represents air density is ρ.

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