An altimeter is an instrument that measures altitude (the distance above sea level or some other chosen point). Aircraft use two different types: the aneroid (barometric) altimeter and the radio altimeter. The aneroid altimeter derives a quantity for...

An altimeter is an active instrument used to measure the altitude of an object above a fixed level. The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth...

Falling from the sky doesn't feel like it does in a dream. At 11,500 feet, it's more tactile, more unnerving, fast. In less than 13 seconds you hit terminal velocity, about 120 mph, the whooshing air overwhelming other sounds and flapping your...

An American climber is leading an expedition up Mount Everest to resolve the debate about who was the first to scale the world's highest peak.Conrad Anker of Big Oakflag, Calif., and his team are trying to retrace the 1924 climb of George Mallory and Sandy...

An expedition retracing the 1924 Mount Everest expedition by George Mallory and Andrew Irvine returned from the mountain Wednesday unable to say whether the men were the first to scale the world's highest peak.Climbers from the Altitude Everest Expedition 2007 returned to the Nepalese capital...

In December 1995, an American Airlines jet slammed into a mountain while descending in clear conditions near Cali, Colombia.The crash claimed 159 lives.The year before, a Learjet 25D operated by Mexican carrier Taesa hit trees while approaching Dulles International near Washington, D.C. It cost 12...