Re: [ATM] water drive

["Vladimir Galogaza" <vladimir.galogaza@zg.htnet.hr>]

>Assuming that's correct - that the pressure would gradually
>decrease with the water level - if you drained it from the
>surface wouldn't the pressure remain constant?

Chemists know that there is simple way to drain the bottle of water
so that flow does not depends on the water level in the container.
Imagine bottle with stopper through which a tube is going
almost to the bottom.  At the beginning water level in the tube
and in the bottle are the same. If at bottom is drain, water flows out,
there is less water in bottle creating underpressure,  atmospheric air
being sucked enters the tube and drives the water in the tube out and
escapes into a bottle. Thus in spite of the level of water in the bottle
the flow at drain is defined with the pressure at the tube
 end which is constant ( within constancy of the atmospheric
pressure) and is given by the vertical distance of the tube end from the
drain hole,
until water level drops to the tube end.
Drawing will help but unfortunately this is not possible.

Regards
Vladimir.





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