Before revision: Dynamic pressure Dynamic pressure , q, is defined mathematically as where ρ is the local air density, and v is the vehicle's velocity; the dynamic pressure can be thought of as the kinetic energy density of the air with respect to the vehicle .
After revision: Dynamic pressure Dynamic pressure , q, is defined in incompressible fluid dynamics as where ρ is the local air density, and for incompressible flow equals the difference between total pressure and static pressure and v is the vehicle's velocity; the dynamic pressure can be thought of as the kinetic energy density of the air with respect to the vehicle .