How does a pitot static system work?
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The device contains a short tube with one open end that faces directly toward the stream of air or other fluid. When no fluid is moving into the opening, a minimum pressure, called the static pressure, is exerted against it. When a stream is flowing into it, the pressure rises by an amount that depends on the velocity of the stream. Behind this tube is another tube with a number of small vents at right angles to the direction of the first tube. When a stream raises the pressure against the opening of the first tube, the pressure against the vents is still equal to the static pressure. A suitable gauge compares these pressures, using the static pressure as a reference, and gives a reading in units of velocity.
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