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Meteorology > Altimetry > Flashcards

Altimetry Flashcards

1
Q

What is Altimetry?

A

The study of pressure variation within the atmosphere.

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2
Q

What factors affect atmospheric density?

A

Pressure
Humidity
Temperature

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3
Q

How does pressure affect atmospheric density?

A

The greater the pressure, the greater the density.

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4
Q

How does humidity affect atmospheric density?

A

The greater the humidity, the lower the density. This is because water vapour is less dense than dry air.

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5
Q

How does temperature affect atmospheric density?

A

The greater the temperature, the lower the density. This is because atoms take up more space as temperature is increased.

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6
Q

What are the units of pressure?

A

Hecto-Pascal hPa
Inches of Mercury in Hg

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7
Q

What is the ISA value for pressure?

A

1013.25 hPa
29.92 in Hg

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8
Q

What is ISA?

A

Internation standard atmosphere. A set of average values which are utilised for the calibration of aircraft altimeters.

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9
Q

What are altimeters?

A

The cockpit instrument that indicates height by sampling the static (undisturbed air) pressure.

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10
Q

What weighs more an identical column of warm air or cold air?

A

A column of cold air will weigh more than an identical column of warm air.

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11
Q

If they weigh the same, what is taller, a column of warm air or cold air?

A

A column of warm air will be taller than a column of cold air, if they weigh the same.

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12
Q

What is the basis of the cockpit altimeter?

A

Aneroid barometer

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13
Q

How is the pressure datum for the cockpit altimeter altered?

A

Through the sub-scale.

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14
Q

Describe your height if you are using QNH

A

Altitude above mean sea level

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15
Q

Describe your height if you are using QFE

A

Height above aerodrome level, or other datum

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16
Q

Describe your height if you are using the standard pressure setting

A

Level above the standard pressure level

17
Q

What does the aircraft altimeter setting depend upon?

A

The phase of flight.

18
Q

Why is ISA pressure of 1013.2 used?

A

When flying at higher levels, aircraft set the ISA pressure because their vertical separation from each other is more important than their separation from the ground.

19
Q

What is height?

A

Vertical distance from the QFE datum

20
Q

What is altitude?

A

Vertical distance from Mean Sea Level (MSL)

21
Q

What is Flight Level?

A

Vertical distance above the standard pressure level.

Meteorology (15 decks)

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