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Quote:
| Originally Posted by [b Quote[/b] (Pierre Farrugia @ May 04 2004,09:31)]Maybe off topic but I ask it here. When you dive a trimix diluent what happens to the mix at depth and your inspiration is set to 1.3 PpO2 eg:
If you dive a 17/50 trimix which has a MOD @ 1.4 of 75m what mix would you be brething at 50m ?
Oxygen: You would have 1.3ppO2 so an equivalent to open circuit of 21.6% O2, can you calculate what the other 2 mixes are? |
pierre,
the 'partial pressure' is the 'bar pressure' eg;
50 mtrs = 6 bar pressure
1.3 is the pp02 take 1.3 away from 6 = 4.7 pp of other gases.
this is the breathing loop as distinct from the diluent 17/50
if you wanted to know what % he or nitrogen is in the loop you would have to calculate it using the loop volume - the diference in pp between gas mix and the loop eg.
50 mtrs = 6 bar 17% 02 = 1.02 pp (1.3-1.02 = .28)
6 bar pp - .28 = 5.72 pp divide by 6 bar = .9533
.9533 divide by 100 x 50 = 47.67% he in loop
.9533 divide by 100 x 33 = 31.46% n2 in loop
.9533 divide by 100 x 17 = 16.21% 02 in loop
.28 pp x 6 bar = 4.67% 21.67%
100% loop volume
cheers
barrie