Magnet Myths and Misconceptions

[MarkE]

Looks like we have stumbled onto a subject that you know little about Mark. You do kknow what a jet pump is!dont you?!
Lucky for me,i have been working on pumping systems for over 25 years on mine sites,and knowing this sort of information was a must and part of our training.

The pressure and vacuum reach equilibrium exactly where i have depicted the pressure gauge(minus a very small amount due to friction within the pipes) that reads zero when all pipe sizes are equal in size and length,and a jet pump is used-as i also depicted.

Quote: Were the pressure actually zero at the middle of the upper pipe segment, there would not be any impetus for water to continue to flow past that point.
Are you for real

We have pressure on one side,and vacuum on the other,and you think the water wont flow?

Vacuum is where there is lower pressure than the reference, typically the surroundings.  Negative pressure is a relative term.  Absolute pressure is always positive.

Go place your two hands in a tub of water,and move them fro left to right together-->with a gap of say 1/2 a foot between your hands. Your left hand is creating a pressure ,and your right hand is creating a vacuum on the body of water between your hand. Will the water between your hands move? will there be a point in that volume of water where the pressure and vacume are equal,and will that water still move?

Force is the integral of pressure difference over an area.

[tinman]

Vacuum is where there is lower pressure than the reference, typically the surroundings.  Negative pressure is a relative term.  Absolute pressure is always positive.Force is the integral of pressure difference over an area.

Negative pressure is used in everyday physics and mechanicl engineering-go look it up on google.a vacume exist within a closed medium, and in this case it is between the area of the middle gauge and pump inlet

[MarkE]

Negative pressure is used in everyday physics and mechanicl engineering-go look it up on google.a vacume exist within a closed medium, and in this case it is between the area of the middle gauge and pump inlet

Negative differential pressure is common.  Negative gauge pressure which is negative differential pressure relative to the local atmosphere is common.  Negative absolute pressure requires that a volume contain less than zero matter.  There is no such known condition.

[tinman]

Negative differential pressure is common.  Negative gauge pressure which is negative differential pressure relative to the local atmosphere is common.  Negative absolute pressure requires that a volume contain less than zero matter.  There is no such known condition.

There you go again Mark, throwing in things no one said anything about. Please quote where I said or depicted anything about absolute negative pressure. I now know what you are all about-twisting things around, and placing missbeliefe within others due to your own incorporations that no one ever mentioned. My diagram shows exactly what I said, and is clear for everyone to see. You cant accept the fact that you were wrong, and so you try to save face with some fanciful absolute vacuum that no one here ever mentioned.

Nice try-but an epic fail.

[MarkE]

There you go again Mark, throwing in things no one said anything about. Please quote where I said or depicted anything about absolute negative pressure. I now know what you are all about-twisting things around, and placing missbeliefe within others due to your own incorporations that no one ever mentioned. My diagram shows exactly what I said, and is clear for everyone to see. You cant accept the fact that you were wrong, and so you try to save face with some fanciful absolute vacuum that no one here ever mentioned.

Nice try-but an epic fail.

Tinman where did you say qualify pressure as gage or differential?  It is up to you to say what you mean.  I can go out and buy pressure sensors that are any of the three:  differential, gage, or absolute.