where F is the drag force, ρ (rho) is the air density, V is the air velocity, and A is the cross sectional area. All of these, except Cd, are directly measurable in a wind tunnel so Cd can be thought of the "fudge factor" that accounts for all of the aerodynamic peculiarities of a shape.
Related entry drag form factor
Related category AERODYNAMICS AND AERONAUTICS
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