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TBR: Fluids Flow and Pressure

Discussion in 'MCAT Study Question Q&A' started by justadream, Sep 5, 2014.

  1. justadream

    7+ Year Member

    Apr 29, 2011
    Likes Received:
    TBR Physics II page 99

    TBR says that a toilet uses a siphon and that "in order to have water flow from the intake end to the output end, there must be a net pressure difference, where the gauge pressure is greater at the output end"

    Can someone explain the bolded? Why does pressure have to be greater at the output end? This is not intuitive to me.

    For example, lets say you have 2 adjacent rooms at different pressures (e.g., 1 ATM, 1.1 ATM). When you open the door between the rooms, doesn't air flow from high to LOW pressure?
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  3. mehc012

    mehc012 Big Damn Hero
    5+ Year Member

    Jul 9, 2012
    Likes Received:
    Medical Student
    This is and always has been a horribly worded answer explanation. Your understanding of the 2 adjacent rooms scenario is correct. You can warp TBR's explanation around until it becomes clear that they were trying to say the same thing (but doing so badly), but having done so myself when reviewing that problem, trust me, it's not worth the mental effort.
    justadream and Cawolf like this.

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