Which type of drag is specifically associated with the pressure differential around a wing?

Form drag is specifically associated with the pressure differential around a wing. It arises from the shape of the wing and how air flows around it. As the aircraft moves, the wing generates a difference in pressure between the upper and lower surfaces, which creates lift; however, this also leads to a drag force acting opposite to the direction of motion. The configuration and design of the wing influence these pressure differences, thus affecting the magnitude of the form drag experienced.

Skin friction drag, on the other hand, is related to the friction between the air and the surface of the wing, dependent largely on the surface roughness and the viscosity of the air. Induced drag is a byproduct of lift generation and is related to the vortices created at the wing tips. Profile drag is the combination of both form drag and skin friction drag but does not pertain directly to the pressure differential itself. Understanding these different types of drag is crucial in aerodynamics, as it helps in designing more efficient aircraft.