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Homework Help: Question regarding pressure equ.

  1. Apr 27, 2006 #1
    [tex]\Delta P = \rho g \Delta h[/tex]

    If my water reservoir for my house is high on a hill I can calculate the pressure at the house if I know the height of the reservoir. If I cut a hole at the base of the hill and let the water spray directly up, will it always rise to the height of the reservoir? I mean, you can use the conservation of energy but I just noticed the equation worked both ways with the same values...
     
  2. jcsd
  3. Apr 27, 2006 #2
    Yes, but it is static pressure.

    If the water sprays, it loses energy from entrance/exit losses as well as friction losses of any pipe and therefore never rise to the same elevation. If you were to run a pipe from the bottom of the hill up to the top of the reservoir, the water would eventually rise to the same elevation under a static condition.
     
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