Natural Science Forum / Physics / Relativity / December 2005

I found the answer which is that they are BOTH THE VERY SAME...

Unfortunately other newsgroup, sci.physics, in particular had bad
replies, one person just gave me a bunch of web links on
hydraulics.....where as the answer was very simple.

(We should then be more open to others postings as you can see we are
not always correct in rejecting/understanding equations/theories.....of
course many are too far-fetched/complex to understand)

This newsgroup was the most correct at pinpointing the problem although
as you can see by my first sentence above the answer was very simple
and short which is they are BOTH THE VERY SAME...

I'd like to thank Joe Fisher and Sue for Pinpointing that the fluids
weight was a negligeant variable for the hydraulic press. And PD for
affirming that Bernouilli is used for both (although by itself it's
insufficient for determining h1 & h2 ...you need for both models the
equation h1/h2 = Area2/Area1= conservation of work)

--------------------------------------

They simply omitted minor forces from the equation (meaning they
considered the weight of the liquid as minimal for the press equation
.... so they omited it).

Better Manometer model at the very bottom of:

http://www.cartage.org.lb/en/themes/Sciences/Physics/Mechanics/FluidMechanics/St
atics/Measurement/Measurement.htm

(they use z1&z2 instead of d1&d2 and show that bernouilli alone is
insufficient to determine their values, bernouilli determines the value
of z1+z2 (=h), you then need z1/z2 = Area2/Area1)