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Name: Santash
Status: Student
Grade: Other
Location: N/A
Country: United States
Date: April 2006

How can helicopter fly up to Mount Everest where the air is so thin?

The ability of a helicopter to fly is based in the density of the air. The more dense the air the better it performs. As it seems you know, at the higher parts of the atmosphere it is more difficult. Ultimately, when the air has too little density, the helicopter can not fly.

The density of air is mostly a function of two variables - pressure and temperature. At the top of a high mountain the pressure is greatly decreased (1/2 the sea level pressure at 18,000 feet), but this is made up somewhat (but not completely) by the colder temperatures (decreasing about 3.5 F for each 100 feet).

Larry Krengel

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