Podcast
Questions and Answers
The average of high and low tides is termed as ______.
The average of high and low tides is termed as ______.
Mean Sea Level
[Blank] is the vertical distance from mean sea level (MSL).
[Blank] is the vertical distance from mean sea level (MSL).
Altitude
[Blank] is the vertical distance from a specific datum, for example, from the ground.
[Blank] is the vertical distance from a specific datum, for example, from the ground.
Height
[Blank] is the vertical distance of a point or a level on the surface of the earth from MSL.
[Blank] is the vertical distance of a point or a level on the surface of the earth from MSL.
The highest altitude below which an aircraft will always fly on local QNH is called ______.
The highest altitude below which an aircraft will always fly on local QNH is called ______.
[Blank] is the lowest Flight Level above which an aircraft will always fly on standard QNH 1013.2 hPa.
[Blank] is the lowest Flight Level above which an aircraft will always fly on standard QNH 1013.2 hPa.
[Blank] is the airspace between TA and TL.
[Blank] is the airspace between TA and TL.
Levels of constant pressure at or above the TL separated by a pressure interval corresponding to 500 ft are called ______.
Levels of constant pressure at or above the TL separated by a pressure interval corresponding to 500 ft are called ______.
The change of pressure with time is called ______.
The change of pressure with time is called ______.
The lines joining places of equal pressure change are called ______.
The lines joining places of equal pressure change are called ______.
Flashcards
Mean Sea Level (MSL)
Mean Sea Level (MSL)
The average height between high and low tides, serving as a baseline for measuring altitude and elevation.
Altitude
Altitude
Vertical distance from the Mean Sea Level (MSL).
Height
Height
Vertical distance from a specific reference point, like the ground.
Elevation
Elevation
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Transition Altitude (TA)
Transition Altitude (TA)
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Transition Level (TL)
Transition Level (TL)
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Transition Layer
Transition Layer
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Flight Level
Flight Level
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Pressure Tendency
Pressure Tendency
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Isallobars
Isallobars
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Study Notes
Altimetry Definitions
- Mean Sea Level (MSL): the average of high and low tides
- Altitude: the vertical distance from Mean Sea Level (MSL)
- Height: the vertical distance from a specific datum (e.g., from the ground)
- Elevation: the vertical distance of a point or a level on the surface of the earth from MSL
- Transition Altitude (TA): the highest altitude below which an aircraft will always fly on local QNH
- Transition Level (TL): the lowest Flight Level above which an aircraft will always fly on standard QNH 1013.2 hPa
- Transition Layer: the airspace between TA and TL
- Flight Level: levels of constant pressure at or above the TL, separated by 500 ft (e.g., FL50 = 5,000 ft, FL300 = 30,000 ft)
- Pressure Altitude: indicated when the altimeter sub-scale is set to 1013.2 hPa
Pressure Tendency and Isallobars
- Pressure Tendency: the change of pressure with time
- In India, pressure tendency is calculated for the past 24 hours
- In higher latitudes, pressure tendency is calculated for the past three hours of the current observation
- Isallobars: lines joining places of equal pressure change
- Isallobars indicate areas of rising or falling pressure tendency
- Isallobaric Low: the region of greatest fall enclosed by isallobars
- Isallobaric High: the region of highest rise enclosed by isallobars
- Surface Lows are likely to move towards isallobaric low and intensify
- Isallobaric High indicates weakening of a pressure system
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