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All,

I've always wondered why everyone teaches nitrox mixing by calculating how
much O2 you need to add to the tank.   Why not simply calculate it on the
basis of how much N2 you need ?     For example :

For a 36% mix -->

You need 64% N2
64% of 3000 is         1920 psi of N2
1920 = 79% of X
X = 2430 psi of air to add on top of . . . .
3000 - 2430 = 570 psi of O2 

Much easier than trying to deal with two different percentages and much less
chance of an error.    

This example is, of course, ideal and you might want to throw in a tiny fudge
factor where compressibility differences enter the picture with some mixes
and, of course, you may need to consider the residual gas components as well
if you don't flush the tank at the start.   

Chuck Boone
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