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John replied: #Most [all?] chemical reactions run at rates given by the product of #the concentrations of the constituents. The implied assumption in #the quoted text (above) is correct as far as I can see. The real gist of the original question was "does the presence of an inert carrier gas have any (other than trivial) effect on reaction rates in a gaseous medium?" I just can't see how it can unless it takes part in a competing reaction. #Now there could be differences in details involving the fill but #that was not an issue here. I'm not too convinced about the filling-order argument either if filling is by partial pressures, weight or whatever. Unless inert gases really DO slow reactions ... then say pumping to 40% of 230 bar on pure O2 followed by whatever on N2, Ne, He or whatever should be of no consequence. ie the PARTIAL pressure of O2 is the same (ca 92 bar) at both the part-filled and full stages. Should the limit before O2 cleaning be needed be solely based on pO2 or is fO2 also of importance? Bob Talbot
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