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Assume you have two rooms, both with holes in the wall (more commonly known as open windows), which connect each room to the exterior. The two rooms are connected, but the connection can be closed by a device commonly known as door. Why does the door always shut?

Or isn't it the case that it always shuts, but it is rather a psychological effect that we don't pay attention to an open door before it slams shut?

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    $\begingroup$ It depends on orientation of door opening wrt dominant external pressure gradient. It is possible the both, shutting the door and needed force to close the doors against air pressure. $\endgroup$ – Poutnik Aug 15 '19 at 16:20
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    $\begingroup$ If the door doesn't latch in the closed position you would expect it to swing left and right depending on the currents. If there is a latch, then the ultimate state is always closed, because once closed it cannot open again. $\endgroup$ – Themis Aug 15 '19 at 17:32

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