rawls:Ok...A few more questions for dm candidates.
Okay before I start - I'm going to convert the fsw to msw, as I'm a metric jockey!
#1) You are going on a dive to...let's make it easy...121fsw and you want to know the maximum oxygen mix you can use to maintain a PO2 of 1.4 ata. What is it?
EANx30
#2) You are diving with EAN30 to a depth of 121fsw. What is your PO2?
Umm... pp02 of 1.4
#3) You are diving with EAN30 and your PO2 is 1.4ata. What is your total absolute pressure? What is your depth?
4.67ATA
36.7m (121fsw)
#4) What gas law are you applying and what formula do you use to determine the above answers?
Daltons Law.
For Question1 the formula is: pp02 / ((Depth+10)/10) = 02%
For Question2 the formula is: ((Depth+10)/10) * 02% = pp02
For Question3 the formula is:
For the depth you use: ((1.4/(30/100))*10)-10
For the absolute pressure: ((Depth+10)/10)
10 point bonus question: This one is EXTREMELY DIFFICULT What is the MOD of EAN 50 and EAN100? What is the formula?
EANx50 - 18m (pp02.1.4) - 22m (pp02.1.6)
EANx100 (or Pure Oxygen) - 4m (pp02.1.4) - 6m (pp02.1.6)
MOD = ((pp02/(Mix/100))*10)-10
Step by step Formula
1. Mix / 100 = y
2. pp02 / y = x
3. x * 10 = z
4. z - 10 = MOD
These should be easy questions for those of you in a dm course and each of the answers is in the other questions, except for the extremely difficult bonus. If you find them difficult then study, study, study.
Mike and Trickster do not qualify for the Bonus question
Why not hehe I'm still a divemaster in training - I need all the help I can get!!