At least 50% of the lift created by an airfoil is due to Bernoulli's theorem of physics, which states " as the velocity of a fluid (air) increases, its internal pressure decrease " .
Air will try to flow from high to low. Since the air travels faster over the airfoil, a low pressure area is created.
Only then will it have the capability of producing lift.
The curved surface of the airfoil is called " camber ". A line, an imaginary straight line from the leading edge to the trailing edge of the airfoil, is called the " chord ". As you can see, the upper curve or camber of the airfoil is greater than the bottom, which is almost a straight line.
Now, let us imagine a piece or block of air striking the leading edge of the airfoil. The piece of air will split in half, one half will go over the top of the airfoil and the other half will go under it. Since that piece of air must come exactly together again when the two halves meet at the back of the airfoil, you will see that the top piece of air must travel farther, therefore, faster, than the piece of the air. Which travel under the airfoil.