Atmosphere

Question 1

Heights of the layers of the atmosphere

Answer 1

Troposphere: up to 11km (36090 ft)
Isothermal: up to 20km
Stratosphere: up to 50km
Mesosphere: up to 80km

Question 2

Key atmospheric pressures and their heights (ISA)

Answer 2

0 ft = 1013.25 Hpa
up to 10k ft = 700 Hpa
up to 18k ft = 500 Hpa
up to 30k ft = 300 Hpa
up to 38k ft = 200 Hpa
up to 52k ft = 100 Hpa

Question 3

Atmospheric pressure lapse rates (ISA)

Answer 3

up to 10k ft = 27ft per Hpa
up to 18k ft = 37ft per Hpa
up to 40k ft = 47ft per Hpa
40k ft + = 111ft per Hpa

Question 4

Atmospheric density lapse rates (ISA)

Answer 4

at 10k ft = 0.903 kg/m^3 75%
at 22k ft = 0.609 kg/m^3 50%
at 40k ft = 0.302 kg/m^3 25%