Air consumption rates.

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I was taught that SAC is pressure/time, PSI/min, and is cylinder dependent. I was taught RMV is volume/time, cu ft/min, and is cylinder independent. For me, both of these are normalized to 1 atm, the surface. Others were taught differently and/or use different or additional terminology.

Running through an example using the DiveNerd Sac Rate/RMV Calculator may help understand the way I see it DiveNerd - SAC Rate / RMV Calculator, Imperial Units
 
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I was taught that SAC is pressure/time, PSI/min, and is cylinder dependent. I was taught RMV is volume/time, cu ft/min, and is cylinder independent. For me, both of these are normalized to 1 atm, the surface. Others were taught differently and/or use different or additional terminology.
When normalizing a Depth Consumption Rate (DCR) to Surface Consumptiom Rate (SCR) in either volume/minute or pressure/minute, you have to divide by the depth in ATA that it was determined from for a given tank cylinder used. Therefore your SCR will have units of either volume/minute * ATA, or pressure/minute * ATA.
 

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