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    (Original post by nikk)
    I would agree with this. It is probably that the wind outside creates a slightly lower air pressure relative to that in your room (Bernoulli's principle). The air movements as a result of this pressure difference results in your door knocking about.
    I don't lie.

    As wind passes by the window its pressure drops as it is moveing faster then the stationary air inside your room. The higher pressure inside your room will mean air is sucked out of your room so now there is higher pressure air on the other side of your door which forces it open (or closed if your door opens outwards)

    This effect happens a lot if there are other windows open in the house as the changing airflow will move the door open and closed. You could just keep the door closed completly and then it wont move.
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