High Quality Content by WIKIPEDIA articles! In fluid dynamics, the drag equation is a practical formula used to calculate the force of drag experienced by anobject due to movement through a fully-enclosing fluid. The equation is attributed to Lord Rayleigh, who originally used L2 in place of A (with L being some linear dimension). The force on a moving object due to a fluid is: where FD is the force of drag, which is by definition the force component in the direction of the flow velocity, ? is the mass density of the fluid, u is the velocity of the object relative to the fluid, A is the reference area, and CD is the drag coefficient ? a dimensionless constant, e.g. 0.25 to 0.45 for a car

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