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I Bernoulli's equation

  1. Nov 26, 2016 #1
    When using Bernoulli's equation to describe fluid that is coming out from a spigot, why is it that P1 = P2 are the same? This cancellation will eventually lead to the Torricelli's equation.
     
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  3. Nov 26, 2016 #2

    Doc Al

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    Staff: Mentor

    In deriving Torricelli's theorem, both ends of the streamline are assumed to be at atmospheric pressure. (They are exposed to the atmosphere.)
     
  4. Nov 26, 2016 #3
    Isn't the pressure supposed to be internal pressure?
     
  5. Nov 26, 2016 #4

    Doc Al

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    Staff: Mentor

    Yes, it's the pressure inside the fluid. At those points that pressure must match the external atmospheric pressure.
     
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