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 12-19-2012, 10:13 PM #1 Member   Status: Pre-Medical Join Date: Jan 2012 Posts: 97 pressure in BerBernoulli's equation!!! SDN Members don't see this ad. (About Ads) In Bernoulli's equation: P+ pgh+ 1/2pv^2=K, is P gauge pressure or absolute pressure? thanks a lot.
 12-19-2012, 11:16 PM #2 117     Status: Pre-Medical Join Date: Sep 2011 Posts: 1,112 Depends On the situation
 12-20-2012, 03:01 PM #3 1K Member     Status: Pre-Medical Join Date: Dec 2009 Location: Where the rain grows Posts: 1,896 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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