Daniel Bernoulli explained that the pressure of a moving fluid (liquid or gas) varies with it’s speed. He said that an increase in the speed of the fluid would create a decrease in pressure.
Since the upper surface of an airfoil has larger camber than the lower, airspeed is increased across the top creating a lower pressure than the bottom. With this effect the lifting properties of an airfoil are actually greater across the top than across the bottom.
As you can see by looking at this cross section of an airfoil, the top portion of the airfoil (or upper cambered surface) has a greater curve than the lower portion (or lower cambered surface).
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