Combining the above with the expression for Mach number gives an expression for TAS as a function of impact pressure, static pressure and static air temperature ( valid for subsonic flow ):
12.
Some authors in the field of compressible flows use the term " dynamic pressure " or " compressible dynamic pressure " instead of " impact pressure ".
13.
:To counter the impact of any projectile, you want to spread the force out over as large of an area as possible to reduce the impact pressure and you also want to spread the impact out over as long of a time period as possible.
