4 May
2005
4 May
'05
6:43 a.m.
At 08:13 AM 5/4/2005, Paul Koning wrote:
Unpressurized planes (small planes) simply have the
ambient air
inside. Pressurized planes (airliners) compress the outside air
roughly to the pressure that prevails around 8000 feet or so. It's
still plain old air, 21 percent oxygen.
They control the humidity, though, to save weight.
- John