Partial Pressure means that the pressure a gas contributes to the total
pressure is in direct relation to its proportion of the total gasses....
I don't know if I said that well. Let me give an example...
Air is 80% nitrogen, 20% oxygen. So, at the surface, nitrogen
contributes 80% of 1 atm pressure (or 0.8 atm), and the oxygen contributes 20%,
(or 0.2 atm), for a total of 1 atm between the two.
So, at 5 atm (132 feet depth, saltwater) the partial pressure of oxygen in
air is 1 atm (0.2 x 5 atm) . That's the same as pure oxygen
(100%) at the surface (1 atm).
Did I just make mud of it?
Stan
In a message dated 1/18/2005 4:09:22 P.M. Eastern Standard Time,
thijs-struijs@planet.nl writes:
Bill and the rest,
Pressure compensation of battery pods and
trusters with air seems the most simple and clean way to do it i think. It
also has the advantage that you don't have to put a square battery in a
bulky round box. But in a discussion on this subject a view years ago Michael
Wludarczyk wrote that at higher pressure (300 psi / 200 mtr.) the
partial pressure of the oxygen (PPO2) becomes so high that there is a
substantial fire risk. This is of course a lethal depth for an ambient sub but
i want to go to 100 mtr. in an 1 atm. sub. Eigther i missed something during
my schooldays or i simply forgot but PPO2 doesn't mean anything to me.
Is there someone on the list who can say something sensible about
this?
Thanks,
Thijs Struijs
The Netherlands