Also known as: fl.
FL has various meanings in the Governmental & Military category. Discover the full forms, definitions, and usage contexts of FL in Governmental & Military.
Altitude at barometric setting of 1013.2 millibars or 29.92 inches of mercury, expressed in rounds hundreds of feet. This is usual mostly above 18,000 feet. FL350 is 35,000 feet.
Governmental & MilitaryIn the Royal Navy, the senior lieutenant on board; responsible to the Commander for the domestic affairs of the ship's company.
Governmental & MilitaryThe freezing level, or 0 °C (zero–degree) isotherm, represents the altitude in which the temperature is at 0 °C (the freezing point of water) in a free atmosphere (ie allowing reflection of the sun by snow, etc). Any given measure is valid for only a short period of time, often less than a day.
Governmental & MilitaryA unit of luminance (photometric brightness). The foot-lambert describes the luminance of a surface that emits or reflects one lumen per square foot; it is the luminance of a perfectly reflecting surface under an illumination of one foot-candle. One foot-lambert equals 0.3183 candles per square foot.
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