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→How to measure pressure
The difference between the pitot tube reading and the static port reading is the dynamic pressure.
Note that there are restrictions on both of these regarding the relative direction with respect to the flow. Given that most of the times an aeroplane flies straight and level, the designers will use this attitude to design the The pitot tube and the static portare designed to function correctly when the aeroplane is flying unaccelerated with zero yaw and small angle of attack. If a significant amount of yaw is present, or if the angle of attack is extreme (such as when an aeroplane is stalledor flying inverted), these pressure readings will be unreliable. In case of intentional inverted flight, additional devices may be fitted to the pitot tube to improve the accuracy.
For reasons that should be obvious by now, it is important that the pitot tube and the static port are not blocked. This should be a part of the daily inspection of an aeroplane. Furthermore, there is a chance that the pitot tube may ice up in flight, for example, if the aeroplane is flown in rain at low temperatures.
