The Atmosphere

Question 1

What are the gases in the atmosphere? What are their percentages?

Answer 1

Nitrogen (79%)
Oxygen (20%)
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 OR 15-30 km

Question 3

What are the layers of the atmosphere?

Answer 3

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

Question 4

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

Answer 4

36,000 ft
-56.5˚C

Question 5

What is the temperature above the Tropopause?

Answer 5

-56.5˚C

Question 6

Mean Sea Level Density

Answer 6

1.225 kg/m3

Question 7

Mean Sea Level Pressure

Answer 7

1013.25 hPa

Question 8

Mean Sea Level Temperature

Answer 8

15˚C

Question 9

Pressure Lapse Rate

Answer 9

27ft / hPa

Question 10

Temperature Lapse Rate

Answer 10

2˚C / 1000 ft

Question 11

Density Lapse Rate

Answer 11

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

Question 12

What is the density of water vapour?

Answer 12

760 g/m3

Question 13

What is the standard equation for calculating the ISA?

Answer 13

ISA = 15˚C - (2 x 1000 ft)