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BP = K x [1-(6.8745 x 10-6 x Alt)]5.2561

Where:

 

 BP                = Barometric pressure, in.w.g., in.Hg, or Psia
 Alt                = Altitude above sea level, ft.
 K                = A Constant,        407.1894 Inch Water/atm
                         29.921 Inch Mercury/atm
                         14.696 Psia/atm