Why do airplanes fly so high?

Subject: Why do airplanes fly so high?

Date: Wed Mar 30 19:13:15 2005
Posted by Tom Lander
Grade level: nonaligned School: No school entered.
City: Douglassville State/Province: PA Country: USA
Area of science: Physics
ID: 1112231595.Ph

Message:


I assume it's because the air is less dense, meaning less friction, thus using 
less fuel (so cheaper).
However, if the air is less dense, isn't there also less ?

Re: Why do airplanes fly so high?

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