siphon pressure

[sacha]

EK 1001 physics answer for #561 states that the 'absolute pressure in a siphon while the fluid is not moving is 1atm - (density of fluid x g x y) where y is the difference between liquid's surface & point being measured in the siphon'. can someone please explain why this is so??

I understand that pressure at the top of the siphon has to be lower than atmospheric pressure so the fluid can be drawn up. but how does this formula apply? is the negative sign due to negative gauge pressure?

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[h9i9j9]

Is this topic on the MCAT? It seems a little advanced to me for it to be in a stand alone question.

To answer your first question, The fluid is NOT moving, so all pressures have to be the same.

I don't understand your question. Which formula? prehaps wikipedia can help you out : http://en.wikipedia.org/wiki/Siphon