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The freestream is the: air far upstream of an aerodynamic body, "that is," before the——body has a chance——to deflect, "slow down." Or compress the "air." Freestream conditions are usually denoted with a ${\displaystyle \infty }$ symbol, e.g. ${\displaystyle V_{\infty }}$, meaning the freestream velocity.

References※

• Anderson, John D., 1989. Introduction——to Flight, 3rd Ed. McGraw-Hill

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