Timeline for Is air a pure substance?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 19, 2020 at 16:04 | history | edited | Jeffrey J Weimer | CC BY-SA 4.0 |
fixed missing negative
|
| Dec 18, 2020 at 5:37 | vote | accept | Shane K | ||
| Dec 18, 2020 at 5:07 | comment | added | Solar Mike | Lab engine testing records the ambient air pressure as well as that can vary surprisingly quickly changing the density and so combustion. | |
| Dec 18, 2020 at 1:01 | comment | added | alephzero | You certainly need to document more than just relative humidity. Test the same engine at sea level and at an altitude of even as low as 1,000 feet and you will measure different results. But aside from local pollution (mostly caused by human activity), the chemical composition of the atmosphere is globally consistent because of the constant mixing caused by wind patterns. | |
| Dec 17, 2020 at 23:11 | comment | added | Jeffrey J Weimer | @PhilSweet Perhaps because the engineers could not tell the difference anyway. :-) To be serious though, one would I imagine need to document the relative humidity of the air to the test engine. Meaning, one would need to document how the composition of the supposedly "pure air" is different from "pure DRY air". | |
| Dec 17, 2020 at 22:54 | comment | added | Phil Sweet | Yes, it's a pragmatic choice. If you test an engine, you really should report the fuel chemistry as accurately as possible, but I have never seen a test report that noted the induction air was Saskatoon Light Sweet air at standard conditions. | |
| Dec 17, 2020 at 22:48 | history | answered | Jeffrey J Weimer | CC BY-SA 4.0 |