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Old 12-19-2012, 10:13 PM   #1
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Default pressure in BerBernoulli's equation!!!

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In Bernoulli's equation: P+ pgh+ 1/2pv^2=K, is P gauge pressure or absolute pressure? thanks a lot.
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Old 12-19-2012, 11:16 PM   #2
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Depends On the situation
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Old 12-20-2012, 03:01 PM   #3
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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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