Question

The air speed above the airfoil is below the airfoil. Hence, the pressure above the airfoil is the pressure below.

• A. lower than
• B. equal to
• C. greater than
• D. opposite to

Answer 1

Answer: (A), (C)

The correct options are
A lower than
C greater than

In the given airfoil diagram, we can see that the air has to travel a wider path above the airfoil, so the air speed becomes higher than below the airfoil.Because of this, the density above the airfoil is lower than below the airfoil, which decreases the atmospheric pressure above the airfoil. The difference in pressure generates a lift that helps the plane to fly.