oxygen demand 10000 ft vs 15000 ft

[chr]

Hello


ok , so why there is oxygen demand greater at 10000 ft than at 15000 ft ? :bored:





https://cimg4.ibsrv.net/gimg/pprune.org-vbulletin/1364x768/10000_ft_8057d384656566f6e8863b2f6e1d2485bcfaffa3.png
https://cimg5.ibsrv.net/gimg/pprune.org-vbulletin/1364x768/15000_ft_4a268a5326967ac568376fb4492aba67c7ab1b6b.png

[FlyMD]

The greater the ambient pressure, the more air your lungs can take in at a constant oxygen pressure…. Think of it as the same thing as diving: you use more air from your bottle the deeper you dive.

I know it‘s counter-intuitive, but true: if you have a cabin decompression when flying over the Himalaya, stopping the emergency descent at FL220 (for example) will allow you to fly further before descending to 10‘000ft cabin altitude or below than if you make your terrain-stop at FL180…

of course this only applies to those people on board who are hooked to an oxygen bottle with pressure regulator: the pax sucking oxygen from a chemical generator don‘t really care as the have a fixed-time supply…

[chr]

make sense , thanks for clear reply