History a Untill the late 1930s, engineers could ignore the compressibility of air a Aerodynamics, a subject to compressible gas and air flow, makes possible the remarkable progress in modern aeronautics and astronautics Ernst mach Prandtl von karman7 History ❑ Untill the late 1930s, engineers could ignore the compressibility of air ❑ Aerodynamics, a subject to compressible gas and air flow,makes possible the remarkable progress in modern aeronautics and astronautics Ernst Mach Prandtl von Karman