You are correct, the naive formula, assuming ideal gases, does indeed give
different results than what Subsurface shows you.
Subsurface takes gas compressibility into account which leads to slightly
different and generally lower consumption numbers.
Details have been explained very nicely here in a post of one of our developers
https://thetheoreticaldiver.org/wordpress/index.php/2017/11/02/when-real-gas-corrections-matter/
You can also find many threads about this topic in the archives...
/D
On December 31, 2021 4:40:08 AM HST, "Oliver@Koschorreck via subsurface"
<subsurface@subsurface-divelog.org> wrote:
>Hi
>unfortunately the air consumption calculation seems to be incorrect !
>Bottle volume, start air pressure minus end air pressure, divided by
>time Divided by avarage depth = AMV liters / min.
>Unfortunately, the bill is always too little.
>
> Greetings and thanks Oliver Koschorreck
>
>
>
>Hallo
>leider scheint die Luftverbrauchs Rechnung fehlerhaft zu sein !
>Flaschenvolumen, Start Luftdruck minus Ende Luftdruck, Dividiert durch
>Zeit Dividiert durch avarage Tiefe = AMV Liter /min.
>Leider ist die Rechnung immer zu wenig.
>
> Grüße und Danke Oliver Koschorreck
>
>
>--
>Oliver Koschorreck
>Richard-Wagner Str. 69
>69259 Wilhelmsfeld
>
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