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In fluid dynamics, the drag coefficient (commonly denoted as: formula_1, formula_2 or formula_3) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water. It is used in the drag equation in which a lower drag coefficient indicates the object will have less aerodynamic or hydrodynamic drag. The drag coefficient is always associated with a particular surface area.
dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment