English: This image shows a boundary layer schematic. Shown are the free stream, laminar and turbulent time-averaged velocity profiles (in green) of a boundary layer. The fade between the two colors representing the fully developed laminar (dark blue) and fully developed turbulent (red) regions, highlights the transition region. The hump at the transition point highlights the difference in thickness of a laminar boundary layer compared to a turbulent boundary layer. The vertical scale is greatly exaggerated.