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First of all, thanks to all who responded, I appreciate your efforts.
I've learned, beyond doubt, that the weight of air changes based on
pressure, temperature, and humidity.
I asked the question with one eye on my other current quest, the bouyancy
of tanks.
What I had hoped to do was to weigh the tanks, full and empty, and work
backwards, and determine how much air they REALLY hold (as opposed to how
much air the manufacturers and dive store wizards CLAIM they hold).
It now appears that that is impossible, given the equipment and finances
available to me.
It has been proposed to sink the tanks, measure the water, and arrive at
the volume of the cylinder.
Then fill the tank with water, measure the water, and use Boyle's law to
calculate the weight of the tank full.
The weights, full and empty, can then be compared to the weight of the
volume of sea water, to arrive at full and empty bouyancies.
The problem that I have with this procedure is doesn't it match what the
dealers and manufacturers did?
Aren't we going to arrive at the same figures they did?
Why don't we just believe them, then?
What I want to do is weigh the tanks, empty and full, and use those
weights to calculate bouyancy and gas capacity.
The problems with that are lots and lots.
Getting all the gas in all the tanks to the same temperature.
Getting all the tanks to their working pressure at that temperature.
Getting an ACCURATE weight, probably to the 100th of a pound.
Developing a system that will allow this to be accomplished on different
days (sequentially).
Comments?
Thanks!
Lyle
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"Huh?"
--Jammer, 1992
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