FreeFlyFreak
Contributor
Up until the part about recording it in an app on my phoneOld school
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Up until the part about recording it in an app on my phoneOld school
Since the SAC on the Perdix merely is a better guess, because it completely ignores some high pressure effects, I don't rely on it too much anyway.
Shearwater measures pressure changes. To get to volume changes "accurately" you should assume it is a Van der Wal gas, not a perfect gas. This makes a small difference in volume calculations at high pressures.Could you please elaborate?
Shearwater measures pressure changes. To get to volume changes "accurately" you should assume it is a Van der Wal gas, not a perfect gas. This makes a small difference in volume calculations at high pressures.
Yup.Ah, the difference in compression - I can live with an error that small.
Harry Averill:Here are some of the things I’ve had tech Instructor candidates tell me when I asked them to explain the difference between the two:
Of course, every one of these statements is wrong. Dead wrong.
- One is metric; the other imperial
- You measure SAC in psi and RMV in cubic feet
- RMV is for CCR diving; SAC is for open circuit