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Understanding Altitude: Difference between revisions
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== Pressure Altitude == | == Pressure Altitude == | ||
'''Pressure''' altitude is the altitude shown on an aircraft [[Instruments/altimeter|altimeter]] when it is set to the ''International Standard Atmosphere'' ('''ISA''') standard pressure" (29.92 inches of Mercury). When flying in Class-A airspace (above 18,000 [[MSL]]) pilots are required to set their altimeters to ISA, and fly at a "flight level" assigned by Air Traffic Controllers. Using this standard setting helps pilots to maintain more accurate vertical separation between aircraft at higher altitudes. Pressure altitude is also used to calculate density altitude. | '''Pressure''' altitude is the altitude shown on an aircraft [[Instruments/altimeter|altimeter]] when it is set to the ''International Standard Atmosphere'' ('''ISA''') standard pressure" (29.92 inches of Mercury). When flying in Class-A airspace (above 18,000 [[MSL]]) pilots are required (in some countries) to set their altimeters to ISA, and fly at a "flight level" assigned by Air Traffic Controllers. Using this standard setting helps pilots to maintain more accurate vertical separation between aircraft at higher altitudes. Pressure altitude is also used to calculate density altitude. | ||
== Density Altitude == | == Density Altitude == | ||