Understanding Altitude: Difference between revisions

Understanding Altitude (view source)

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 ==== Pressure Altitude ====
-'''Pressure''' altitude is the reading on your [[Instruments/altimeter|altimiter]] when you reset it to 29.92 inHg, which is the ''International Standard Atmosphere'' ('''ISA'') pressure for sea level. In the so-called flight levels. Often, but not always, above 18,000 ft MSL). Pilots are required to set their altimeters to ISA and fly by pressure altitude. Pressure altitude is important for altimetry and for calculating density altitude.
+'''Pressure''' altitude is a reading on an your [[Instruments/altimeter|altimiter]]. When you reset it to 29.92 inHg, which is the ''International Standard Atmosphere'' ('''ISA''') pressure for ''mean sea level''. In [[flight levels]], often, but not always, above 18,000 ft '''MSL'''. Pilots are required to set their altimeters to ISA and fly by pressure altitude. 18,000 feet above a beach is very high so this is a way to calculate it.
+Pressure altitude is important for altimetry and for calculating density altitude.
 == Density Altitude ==