Atmosphere

Question 1

What are the percentages of the different gases in the atmosphere?

Answer 1

78% Nitrogen, 21% Oxygen, 1% other gases.

Question 2

What are the 4 layers of the atmosphere starting at sea level?

Answer 2

1. Troposphere
2. Stratosphere
3. Mesosphere
4. Thermosphere

Question 3

In the lower part of which layer does the temperature remain constant?

Answer 3

Lower Stratosphere

Question 4

What happens to Pressure, Temperature, and Density in the troposphere as altitude increases?

Answer 4

They all reduce.

Question 5

Briefly explain what the International Standard Atmosphere (ISA) is.

Answer 5

It is an internationally agreed set of standard values at various altitudes, including pressure, density, and temperature, used to compare aircraft performance.

Question 6

Explain how temperature changes as altitude increases through the troposphere to the lower stratosphere.

Answer 6

The temperature drops constantly through the troposphere, then remains constant in the lower stratosphere.

Question 7

What are the ISA standard values at sea level for pressure, temperature, and density?

Answer 7

Pressure: 1.01325 bar (1013.25 mb, 101325 N/m², 14.7 psi)
Temperature: 288.15 K (15°C)
Density: 1.225 kg/m³