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more details



It is necessary to give more details of the logical structure of "gravity
+ cohesion" theory:

1. The liquid in longer arm is heavier than the liquid in shorter arm.
When
it goes down, it pulls up the liquid in shorter arm (favourit analogy is
the motion of the chain passing over a frictionless pulley, always in the
direction of longer side). The shorter arm is pulling out the liquid from
the higher vessel.

2. In order that such pullings can happen, it is necessary that the liquid
can sustain positive stress (or negative pressure).

Needless to say, such a property does not verify that the theory is
correct. As Hero has shown, more thatn two tousend years ago, the weight
of the liquid is not the right causal factor.

His point is:

Having arms of different radius, it is possible to have the liquid in
short arm much heavier than the liquid in longer arm, and the siphon will
work. Nevertheless, if the arm from which the liquid shoul flow is
shorter, but duw to the bigger radius, the liquid in it is heavier, the
siphon would no work.

So, the right causal factor is not the weight of liquid in, but the lenght
of the arm.

I hope this might help.

Josip