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    1) When I open my window my door may open without human provacation. My door opens inwards. If my window is shut this NEVER happens. Why?

    2) I filled a cup with water and there was a small cluster of bubbles on the top of the cup. I turned on the tap and the bubbles dispersed. After turning the tap off again almost instantly, the bubbles re-joined rather quickly. Why?
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    I'm not a physicist but I'm somewhat close. The door opening is to do with pressure change, if you open your window and the air is moving outside it's probably going to be a lower pressure of that inside the room, this sucks out air inside your room and sucks your door open to even the balance between your room and the rest of the house.

    As with the bubbles, was the cup next to the flowing water of the tap? Like right next to? Did the water touch the outside of the cup?
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    thanks for first bit

    second bit: water ran into cup directly, then I turned off the tap and the bubbles rejoined (no overflow)
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    ???
 
 
 
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Updated: April 8, 2011
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