On Fri, 17 Mar 2000, Paul Suds wrote: > Wouldn't you want to keep the O2 a little bit higher (25%) for safety > purposes? > Wouldn't that cause the pressure inside the vessel to slowly increase? Unless, of course, one was circulating the atmosphere more often to compensate. --- Paul Anderson paul@geeky1.ebtech.net http://www.sellad.on.ca/~paul