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BFS - Meteorology > C03 - Atmospheric Pressure > Flashcards

C03 - Atmospheric Pressure Flashcards

1
Q

What type of Atmospheric Pressure is found in bad weather?

A

Low Air Pressure.

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2
Q

What type of Atmospheric Pressure is found in good weather?

A

High Air Pressure.

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3
Q

Falling Air Pressure is associated with what type of weather?

A

Approaching bad weather.

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4
Q

Rising Air Pressure is associated with what type of weather

A

Approaching good weather.

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5
Q

At low levels, what type of pressure is commonly found?

A

High Pressure.

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6
Q

At high levels, what type of pressure is commonly found?

A

Low Pressure.

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7
Q

The pressure caused solely by the effect of gravity on a mass of air is called what?

A

Static Pressure.

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8
Q

1 mbar is equal to how many hPa?

A

1 hPa.

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9
Q

What is the formula for Pressure?

A

P = F ÷ A.

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10
Q

Acceleration of Mass due to the Earth’s gravity is recorded as?

A

1g.

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11
Q

Earth’s gravity is a ‘____’ force?

A

Constant.

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12
Q

True or False. Air Mass variability causes Atmospheric Pressure variability?

A

True.

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13
Q

The ‘____’ the mass of overlying air, the greater the Atmospheric Pressure?

A

Greater.

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14
Q

The lower the mass of overlying air, the ‘____’ the Atmospheric Pressure?

A

Lower.

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15
Q

The denser the air, the ‘____’ the pressure?

A

Higher.

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16
Q

What is a Synoptic Chart?

A

A diagram of variations in surface pressure.

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17
Q

What is the common datum used in a Synoptic Chart?

A

Mean Sea Level.

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18
Q

Define QFF?

A

The Mean Sea Level Pressure of a reporting station corrected for Elevation.

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19
Q

Define Pressure Gradient Force?

A

A force that tries to drive air from an area of High Pressure to an area of Low Pressure.

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20
Q

The greater the pressure difference, the ‘____’ the Pressure Gradient Force?

A

Greater.

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21
Q

What two attributes to a greater Pressure Gradient Force?

A
  • Air moves faster.

- Stronger Wind.

22
Q

What is suggested when having Isobars closer together (2)?

A
  • Stronger PGF.

- Stronger Winds

23
Q

What is suggested when having Isobars further away (2)?

A
  • Weaker PGF.

- Weaker Winds.

24
Q

Strong PGF is known to be associated with which type of pressure?

A

Low.

25
Q

Weak PGF is known to be associated with which type of pressure?

A

High.

26
Q

When does the highest pressure occur during the day?

A

10:00hrs and 20:00hrs.

27
Q

When does the lowest pressure occur during the day?

A

04:00hrs and 16:00hrs.

28
Q

Pressure decreases with Height at a ‘____’ rate?

A

Decreasing.

29
Q

What is the Pressure Lapse Rate formula and its values of measurement (3)?

A
  • (96 x T°) ÷ P.
  • T = Temperature in Kelvin.
  • P = Pressure in hPa.
30
Q

According to ISA conditions what is the Pressure Lapse Rate?

A

27 feet per 1 hPa.

31
Q

Define QFE?

A

Atmospheric Pressure at an aerodrome reference point.

32
Q

An Altimeter set to QFE will read ‘____’ at the aerodrome?

A

0ft.

33
Q

When airborne, an Altimeter set to QFE will read ‘____’?

A

Height above the aerodrome reference point.

34
Q

Define QNH?

A

Atmospheric Pressure which has been mathematically adjusted down to Mean Sea Level.

35
Q

Define SPS?

A

Standard Pressure Setting is the Mean Sea Level pressure of 1013.25 hPa.

36
Q

When will Aircrafts use Standard Pressure Setting and why?

A

To have a common datum when not flying close proximity to terrain/ground.

37
Q

Height using Standard Pressure Setting are known as ‘____’?

A

Flight Levels.

38
Q

What is 27,500ft in Flight Level?

A

FL 275.

39
Q

What is 7,000 in Flight Level?

A

FL 070.

40
Q

Define QFF?

A

Similar to QNH but uses the actual pressure change and temperature, rather than ISA conditions.

41
Q

For airfields above sea level, in warm air QFF is ‘____’ than QNH?

A

Lower.

42
Q

For airfields above sea level, in cold air QFF is ‘____’ than QNH?

A

Higher.

43
Q

For airfields below sea level, in warm air QFF is ‘____’ than QNH?

A

Higher.

44
Q

For airfields below sea level, in cold air QFF is ‘____’ than QNH?

A

Lower.

45
Q

What is the Temperature and Pressure at 0ft (2)?

A
  • +15°C.

- 1013.25 hPa.

46
Q

What is the Temperature and Pressure at 4,700ft / 1.5km (2)?

A
  • +5.5°C.

- 850 hPa.

47
Q

What is the Temperature and Pressure at 9,800ft / 3km (2)?

A
  • -4.6°C.

- 700 hPa.

48
Q

What is the Temperature and Pressure at 18,000ft / 5.5km (2)?

A
  • -21.2°C.

- 500 hPa.

49
Q

What is the Temperature and Pressure at 30,000ft / 9.15km (2)?

A
  • -44.4°C.

- 300 hPa.

50
Q

What is the Temperature and Pressure at 38,600ft / 11.75km (2)?

A
  • -56.5°C.

- 200 hPa.

BFS - Meteorology (22 decks)

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