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>A 40 of 50/50 and a 30 of oxygen makes ocean deco diving a lot more fun
>and much more practical.

Why?

It seems to me that you should reverse those and use 2000 psi of O2 in a 40
and your 50/50 in a 30.

My logic behind this is the volume of gas you would carry in both bottles
would be approximately the same:  The 40 filled to 2000 would have 26.66 cu ft
of Oxygen and the 30 filled to 3000 would have 30 cu ft of 50/50.

Please explain to me why I would want to do it reversed and carry only 20 cu
ft of O2 and 40 cu ft of 50/50.

thanks in advance,

Ted

  

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