Physical units in fluid dynamics

In fluid dynamics, the drag equation is a formula used to calculate the force of drag experienced by an object due to movement through a fully enclosing fluid

FD=12CDρv2AF_D=\frac{1}{2} C_D ρv^2 A where

  • FDF_D is the drag force, which is by definition the force component in the direction of the flow velocity,
  • ρρ is the density of the fluid,
  • vv is the velocity of the object relative to the fluid,
  • AA is the reference area, and
  • CDC_D is the drag coefficient.

What units can the quantity (CD)2(C_D )^2 have?


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