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Fix ATM-vs-bar confusion

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SAC should be calculated in relationship to surface pressure, not "1 bar".

I also realize that we have a few other cases where we do the same
mistake: the partial pressure calculations do things like

    po2 = o2 / 1000.0 * depth_to_mbar(sample->depth.mm, dive);

which is wrong as well - the partial pressure is also relative to
standard atmospheric pressures.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Linus Torvalds 2014-02-11 13:08:29 -08:00 • committed by Dirk Hohndel
parent 92bbed3304
commit e58f54cac1
4 changed files with 16 additions and 6 deletions
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2
profile.c
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@ -226,7 +226,7 @@ static int get_local_sac(struct plot_data *entry1, struct plot_data *entry2, str
/* Mean pressure in ATM */
depth = (entry1->depth + entry2->depth) / 2;
atm = (double) depth_to_mbar(depth, dive) / SURFACE_PRESSURE;
atm = depth_to_atm(depth, dive);
cyl = dive->cylinder + index;