Technology / Motors / Altitude: The atmospheric altitude (height above sea level) at which the motor will be operating: NEMA standards call for an altitude not exceeding 3,300 ft. (1,000 meters). As the altitude increases above 3,300 ft. and the air density decreases, the air stability to cool the motor decreases - for higher altitudes higher grades of insulation or a motor derating are required. DC motors require special brushes for high altitudes.
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Science / Weather / Density Altitude: The altitude at which a given density is found in the standard atmosphere. Used in aviation, it is computed from the station pressure at takeoff and the virtual temperature at the particular altitude MORE
Science / Weather / Pressure Altitude: The altitude in standard atmosphere at which a given pressure will be observed. It is the indicated altitude of a pressure altimeter at an altitude setting of 29.92 inches of mercury, and is therefore MORE
Technology / Aviation / Absolute Altitude: The measureable height of an aircraft above the actual terrain. MORE