The static vent consists of a hole or an array of holes in the skin of the aircraft and is intended to measure the absolute pressure of the still air surrounding the aircraft. But because the air is moving past the aircraft the pres¬sure at various places on the aircraft’s skin is slightly higher or lower than the free stream pressure by an amount called the static defect. The static defect at a particular location depends on the speed, angle of attack, yaw an¬gle, and altitude. The optimum location (i.e. the location which gives the smallest errors) of the static vents is determined by wind tunnel tests.

http://fizyka-smolenska.blogspot.com/2014/02/37-nauka-wolnos...
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Źródłem ciśnienia statycznego mogą być otwory po bokach kadłuba (dajniki ciśnienia statycznego), bądź może być ono pobierane, obok ciśnienia całkowitego, z rurki Prandtla.
https://pl.wikipedia.org/wiki/Prędkościomierz_(lotnictwo)

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http://www.astroloty.eu/wp-content/uploads/2017/03/pitot.jpg
http://www.astroloty.eu/2017/03/05/a-ile-to-ten-samolot-wyci...