On Wed, Mar 2, 2016 at 4:24 PM, Linus Torvalds <[email protected]> wrote: > > I'll post a test-patch soon, working on it right now.
Ok, suggested patch posted. It does the linear mixing, *except* for the case of actual air. I'd rather use the real air table than trust my linear mixing model. It has some funny - but believable - effects. I see 80(77)cuft for air in an AL80 as expected. And now with that gasmix approximation thing, I see 80(78)cuft when I have a 32% nitrox mix. And the reason I say that is believable, is that it actually sounds very reasonable. Oxygen seems to compress *better* than an ideal gas (and much better than Nitrogen), and a pure oxygen mix would be 80(84) because the compression factor at 3000psi is actually 5% lower volume than an ideal gas according to baue. So a higher oxygen content would be expected to compress better. NOTE! I did not use your new air coefficients, I used our old ones from Wikipedia rather than replacing them with your new ones that were based on the table at http://www.baue.org/library/zfactor_table.php It would be interesting to see a plot of (a) the wikipedia coefficients that we use (b) the coefficients for air you calculated from the air table on baue.org (c) the linear 21/79% mix of the O2/N2 (that we don't actually use, since I decided to keep air special, partly because I trust that table more, but partly because we just have a special fractional representation of air anyway) and see how well they match. If they *don't* match well, that would be cause for worry. Linus _______________________________________________ subsurface mailing list [email protected] http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
