If one opens the door below (brusquely), then my door above always shoots open. I suppose if you open the door with great force, the pressure drops due to the air displacement. I then tried to imagine that the air that is being displaced moves and then exerts a pressure on my room door and that, due to that pressure, then flies open. NB There is a lot of space between the hall and my room.
Answer
Dear Massimo,
Your explanation seems like a possible explanation.
Another explanation is that both the room behind the hallway door and your room have a window open (or a crack). Opening the hallway door allows air to flow between the two open windows, which sets your door in motion.
Answered by
Engineer Bart Dierickx
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