On 3 March 2016 at 02:51, Linus Torvalds <[email protected]> wrote: > 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 >
attached is the comparison of the wiki and baue values for air. seem pretty close given the possibility of error when measuring. > (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) > i can try that tomorrow, should the linear mix be compared to the AIR values and if so to which of the tables (baue vs wiki)? lubomir --
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