Hi, Edgar,
It's amazing.
I wonder what the limiting element is. Is it the same in all species of trees?
Well, it would only have to be at its "max" in the trees which grow the
highest, anyway. So, a strong selection-effect, there.
Although, who knows which came first, the Chicken, or Egg-Drop Soup?
Do you suppose it's the microscopic closeness of fiber elements in the tissue,
their "degree-of-packing", which enables greater upward drawing? Or is it all
equal? And, some species just grow higher? Those that don't grow so high,
simply excuse themselves for having such great upward-sucking force (and not
really utilizing the extremity of it)?
I haven't looked into this deeply. The mom of my ex- was a Botanist and
Herbarium Director Emeritus at Berkeley, but she did not instruct us kids on
this point (ultimately, because we did not ask, I guess). ;-) And now she too
is gone, alas. An expert in Desert plants.
Sorry, a bit off-topic, All.
But all Meals at Zen training centers depend on Plants, and plant products.
--Joe
> Edgar Owen <edgarowen@...> wrote:
>
> Yes, most of the upward pumping force of sap in trees is due to capillary
> action. The calculated maximum is a little over 400 feet, which is in fact
> the height of the highest historically recorded trees.
>
> Edgar
>
> On Jul 24, 2013, at 10:22 PM, Joe wrote:
>
> > Suresh,
> >
> > The water travels against gravity up into the heights of the tree, but is
> > assisted of course by the upward-drawing force of capillary action of the
> > phloem and xylem tissue(s) of the tree cell structure, the conducting and
> > supporting tissues of the wood, respectively.
> >
> > Otherwise, 32 feet high, or about 10 meters high, would be the maximum
> > height that one could pump water upwards in height, even with a VACUUM at
> > the top end. The reason is that earth's atmospheric pressure at sea-level
> > will support a column of water 32 feet high, and no higher.
> >
> > Hail!
> >
> > --Joe
> >
> > > SURESH JAGADEESAN <varamtha@> wrote:
> > >
> > > The plain water has to climb against gravitational force for a 20
> > > meters height and start growing flowers,
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