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Why does The piggyback bag produce a slighty higher pressure at the connection point due to its slighty higher elevation.

- Thread starter wolf!
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- #26

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Why does The piggyback bag produce a slighty higher pressure at the connection point due to its slighty higher elevation.

- #27

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So it is down hill from the upper bag to anywhere in the lower bag

The underlying driving force is gravity and we measure this tendency as pressure head which is the difference of elevation.

Downhill is the direction that makes this difference positive.

- #28

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all that is known is that it happens?

- #29

mfb

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The higher bag leads to a higher potential pressure at the connection, this leads to a higher outflow.

- #30

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Hi Wolf!, I'm a nurse, too. From reading this thread, I think I understand the answer. Think of it this way: Imagine a really long tube extending vertically that contains an entire liter of fluid. Now, imagine a shorter tube (same diameter) extending vertically that contains only 100mL of fluid. For all practical purposes, you may ignore the volume of the bags that the tubes are connected to... Think about the very tall column of water in the 1L tube with its higher weight, pressure, and 'desire' :-) to flow first. The fluid (column) in the lower, and thus 'less tall' tube will simply have to wait...

all that is known is that it happens?

...does that help?

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