The subject matter of aerodynamics is finding there are determining the forces and moments, that acts on anybody that moves through a fluid. In our case we are mostly interested in air, but the basic principles are same irrespective of what fluid. It is considering the bodies as an aircraft; see when aircraft moves through a body. It experiences certain force as, you know that aircraft exerts, forces on the air and air in turn exerts forces on it, and this force and moments and estimation of their contribution to the motion that is what, the subject matter of aerodynamics.
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