WARNING! Geek talk follows: Read at your own risk!
The old timey axiom is:
"A pint is a pound the world around."
One pint of water weighs exactly one pound. So, Bob has it exactly
right. There are 8 pints in a gallon, so a gallon OF WATER weighs
exactly 8 pounds.
To get 1 psi, one would have to stack one pint of water inside a
column that has a cross sectional area of one square inch.
One LIQUID pint of water has a volume of 28.875 cubic inches.
Go 28.875 inches deep in water and you'll experience 1 psi
differential pressure compared to whatever pressure is at the surface
of the water. (usually atmospheric pressure)
28.875 is a little more than 2 feet. Spaceman's approximation of 1/2
psi per foot depth in water is reasonable when a rough guess is all
that's needed. That approximation makes for easy off-the-cuff math
done in your head.
If a more precise measurement is required, use the 28.875 in/psi.
This whole calculation demonstrates the beauty of the metric system.
It's a lot easier to use for calculating stuff like this.
Did I confuse or put everyone to sleep with the geek talk?
I am what I am. Accept me for who I am. Don't try to change me
baby! Isn't that a song?
Hope this helps,
geekguy
--- In papercreters@yahoogroups.com, <bob@...> wrote:
>
> Good thinking- I like the thought process. If your form has a
trough on top
> with a water repellent barrier- then you could use water to
compress the
> slurry-more water more compression. What is water about 8 pounds to
the
> gallon? Bob C
>
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