Why does a mountain climber need an oxygen supplyat very high altitudes,even though the air still contains 21% oxygen?
https://academicpapers.net/wp-content/uploads/2020/08/LOGO-300x75.png00Lizhttps://academicpapers.net/wp-content/uploads/2020/08/LOGO-300x75.pngLiz2023-02-14 16:53:012023-02-14 16:53:01Why does a mountain climber need an oxygen supplyat very high altitudes,even though the air still contains 21% oxygen?