L13
Contributor
Exactly. Personally, I use exactly these definitions.@L13
You can measure SAC in pressure/time at the surface, you are then already at 1 atm. Or you can measure SAC at depth and correct by dividing by the atmospheres. Both come out in pressure/time/atm. Calculating SAC for a dive is more realistic than doing it on your couch.
RMV in volume/time is also at 1 atm, could be done at the surface, have only seen it for dives.
Except, we have @Gareth J (with similar # of dives as you, not sure how else to casually measure expertise on SB):
He is using vol/min units for SAC, not pressure/min. And yet, I understand exactly what he is saying(because he specified units).I don't understand how SAC can be confused?
SAC - Surface Air Consumption - that is self explanatory.
For air planning, the SAC is modified dependent on the circumstance.
Being lazy. I tend to use 15 l/min for normal circumstance, 50 l/min for bailout to the first stop. Maybe 20 l/min if it is a high work environment (working against current etc).