I'm looking at a pitot static tube question right now and I just need some clarification. There is the outer hole on the pitot static tube, not the hole that the air stream goes through, but the other tiny one near that. Is the pressure at that hole equal to atmospheric pressure?
A Pitot tube works my measuring the difference between static and total pressure. One opening of the tube is facing the flow: this one sees the total (stagnation) pressure. The other opening is perpendicular to the flow and sees only the static pressure.