Aerodynamics is a branch of ?uid dynamics concerned with studying the motion of air, particularly when it interacts with a solid object, such as an airplane wing. Aerodynamics is a sub-?eld of ?uid dynamics and gas dynamics, and many aspects of aerodynamics theory are common to these ?elds. The term aerodynamics is often used synonymously with gas dynamics, with the di?erence being that "gas dynamics" applies to the study of the motion of all gases, not limited to air. Studying the motion of air around an object allows us to measure the forces of lift, which allows an aircraft to overcome gravity, and drag, which is the resistance an aircraft “feels” as it moves through the air. Everything moving through the air (including airplanes, rockets, and birds) is a?ected by aerodynamics. The rules of aerodynamics explain how an airplane is able to ?y. Anything that moves through air reacts to aerodynamics. A rocket blasting o? the launch pad and a kite in the sky react to aerodynamics. Aerodynamics even acts on cars, since air ?ows around cars. Understanding the motion of air around an object (often called a ?ow ?eld) enables the calculation of forces and moments acting on the object. In many aerodynamics problems, the forces of interest are the fundamental forces of ?ight: lift, drag, thrust, and weight. Of these, lift and drag are aerodynamic forces, i.e. forces due to air ?ow over a solid body. Calculation of these quantities is often founded upon the assumption that the ?ow ?eld behaves as a continuum. Continuum ?ow ?elds are characterized by properties such as ?ow velocity, pressure, density and temperature, which may be functions of spatial position and time. These properties may be directly or indirectly measured in aerodynamics experiments, or calculated from equations for the conservation of mass, momentum, and energy in air ?ows. Density, ?ow velocity, and an additional property, viscosity, are used to classify ?ow ?elds. This book entitled Applied Aerodynamics covers the numerous cases of stationary and nonstationary aerodynamics, which is of invaluable tool for academicians, researchers and professionals.