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pressure in BerBernoulli's equation!!!

Discussion in 'MCAT Study Question Q&A' started by peacefulheart, Dec 19, 2012.

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  1. peacefulheart


    Jan 15, 2012
    In Bernoulli's equation: P+ pgh+ 1/2pv^2=K, is P gauge pressure or absolute pressure? thanks a lot.
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  3. Hemorrage

    Hemorrage Ambrose 5+ Year Member

    Sep 4, 2011
    Depends On the situation
  4. milski

    milski 1K member 5+ Year Member

    Dec 30, 2009
    Where the rain grows
    It is for absolute pressure.. If Pg=Pa+C where Pg - gauge, Pa - absolute and C just a constant and Bernoulli is true for Pa, you have Pg + Pg*gh + 1/2Pg*v^2 = Pa + C + Pa*gh + C*gh + 1/2Pav^2 + Cv^2 = K + C + C*gh + 1/2Pa*v^2 = K' + 1/2Pa*v^2

    You end up with an extra term on the right side, proportional to Pa and v^2, which means that you cannot determine the whole relation solely based on Pg.

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