"C J Campbell" wrote;

....... At the altitudes airliners fly the partial pressure of
oxygen is too low to be absorbed by the bloodstream. You could fill
the
entire cabin with pure oxygen and everybody would still suffocate.
Those
little masks are not pressurized.

If that were true, why would mountain climbers take little bottles of O2
with them when climbing Everest (and other 20K ft. and up mountains)?

--
Marc J. Zeitlin
http://marc.zeitlin.home.comcast.net/
http://www.cozybuilders.org/