what does flight level mean
Flight levels are described by a number, which is this nominal altitude (or, pressure altitude) in feet, divided by 100, while being a multiple of 500 ft, therefore always ending on 0 or 5.Therefore, an apparent altitude of, for example, 32,000 feet is referred to as flight level 320.istorically, altitude has been measured using a pressure altimeter, which is essentially a calibrated barometer. An altimeter measures air pressure, which decreases with increasing altitude following the barometric formula, and from the surrounding's pressure calculates and displays the corresponding altitude.