Explain its physical meaning in terms of the static and kinetic (dynamic) pressures. A wind rotor airfoil is placed in the air flow at sea level conditions with a free stream speed of 10 m/s. The density at standard sea level conditions is 1.23 kg/m3 and the pressure is 1.01 x 105 Newtons/m2. At a point along the rotor airfoil the pressure is 0.90 x 105 Newtons/m2. By applying Bernoulli's equation estimate the stream speed at this point