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Although the detail is a little more complex, as the angle of attack increases the overall static pressure over the upper surface decreases while that on the lower surface increases.
You will be familiar with the usual textbook pictures with arrows pointing away from the surfaces at right angles when the aerofoil is in a moving airflow. These show the magnitude of the static pressure as measured by what we call pressure tappings on the aerofoil's surface.
The difference between static pressure on the upper and lower surfaces is what provides lift, drag, and pitching forces on the wing.
Engineering specialist in aircraft performance and weight control.