Six Skills: Required volume of gas calculations

[David Novo]

I think the bits were you used the average ambiant pressure are only for the ascent portions (this is why you had to average the ambiant pressures)

For your gas planning you need to add as well the gas used at each stop which is just using the ambiant pressure at that depth (no averaging because you are not moving up or down)

As I stated, if the stops at shallower depths are equal or longer than at deeper depths, those estimations will be either realistic or conservative, respectively. Anyway to simplify, we can say that is just for the ascent portions.

Wait a minute, it would not occur to me to use bar for anything but absolute ambient pressure (not counting tank pressure). If there is any doubt there, I can see the confusion. Is that what you mean @tursiops ?

Neither would to me, but maybe @tursiops meant that it could also be hydrostatic pressure.

 

[tursiops]

The bottom line is I object to the use of bar to designate depth.
If you call it ambient pressure, that's much better. "bar" does not mean ambient pressure, it just means pressure, so could be anything.
And don't even try altitude diving!

 

[David Novo]

The bottom line is I object to the use of bar to designate depth.
If you call it ambient pressure, that's much better. "bar" does not mean ambient pressure, it just means pressure, so could be anything.
And don't even try altitude diving!

Just quoted the definitions used in the book... I understand your point.

 

[wstorms]

The bottom line is I object to the use of bar to designate depth.
If you call it ambient pressure, that's much better. "bar" does not mean ambient pressure, it just means pressure, so could be anything.
And don't even try altitude diving!

Fair point, thanks for clarifying.