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Coefficient of drag: is a number without unit   used to calculate the resistance of a fluid on a moved body through

like resistance of water on submarine or air on a vehicle,  bullet , rocket 🚀 or plane ..etc depends on the shape &  the nature of the surface body material & it’s resistance friction ,density of fluid,velocity & applied area... 
Cd is used in the equation of drag .. low  Cd mean low fluid  resistance high Cd mean high fluid  resistance.

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