Hm, based on this the train of thoughts took me to a different question.
Say we have a bottle shaped object flying through the air with a constant velocity (so one inlet, no outlet). What will then be the pressure difference between the outside and the inside of the bottle?
I assume that inside...
I am a bit confused about pressures in and around an aircraft.
Inside the cabin we have a static pressure, since we assume the air is standing still. (I know it's not, due to the Environmental Control system, but let's ignore that).
Outide the aircraft we have the static pressure = p ambient...