The Atmosphere

Question 1

What are the gases in the lower layer of the atmosphere (troposphere)? What are the percentages?

Answer 1

Nitrogen (78%)
Oxygen (21%)
Argon (1%)

Question 2

What does the Ozone layer do? How high is this layer?

Answer 2

Absorbs the UV light from the sun
50,000-100,000 ft

Question 3

Which layer of the atmosphere is the ozone?

Answer 3

Stratosphere

Question 4

What are the layers of the atmosphere?

Answer 4

Troposphere, Tropopause, Stratosphere, Stratopause, Mesosphere, Mesopause, Thermosphere

Question 5

What is the altitude of the Tropopause? What is the temperature at the Tropopause?

Answer 5

36,090 ft
-56.5˚C

Question 6

What is the temperature above the Tropopause (36,090ft)?

Answer 6

-56.5˚C

Question 7

Mean Sea Level Density

Answer 7

1.225 kg/m3

Question 8

Mean Sea Level Pressure

Answer 8

1013.25 hPa

Question 9

Mean Sea Level Temperature

Answer 9

15˚C

Question 10

Pressure Lapse Rate

Answer 10

27ft / hPa

Question 11

Temperature Lapse Rate

Answer 11

2˚C / 1000 ft

Question 12

Density Lapse Rate

Answer 12

non linear
22,000 ft = 50%
40,000 ft = 25%

Question 13

What is the density of water vapour?

Answer 13

0.760 kg/m3

Question 14

What is the density of dry air?

Answer 14

1.225 kg/m3

Question 15

What is the standard equation for calculating the ISA?

Answer 15

ISA = 15˚C - (2 x 1000 ft)

Question 16

What is the equation for Density?

Answer 16

Density is directionally proportionate to pressure & indirectly proportionate to temperature

Question 17

What happens to warm dense air?

Answer 17

Air which is dense and warm will rise and continue to rise

Question 18

What’s the meaning of Troposphere?

Answer 18

The sphere of turn or mixing (gases)

Question 19

What is the Ozone made of? Which level is it found? What is the height it is found?

Answer 19

It’s an allotrope of oxygen made up of 3 oxygen atoms

Stratosphere @ 50,000-100,000ft

Question 20

What is the altitude of the Troposphere?

Answer 20

36,090ft or 11km

Question 21

What is the altitude of the Stratosphere?

Answer 21

164,000ft or 50km

Question 22

What is Pressure? And what unit is it measured in?

Answer 22

Force per unit area

Measured in bars

Question 23

What unit is weather measured in?

Answer 23

Milibar (mb)
1/1000th of a bar

Question 24

If we are climbing in our aircraft, would we expect our pressure to increase or decrease?

Answer 24

Pressure will decrease

Pressure decreases when altitude increases