Atmosphere Flashcards
1
Q
In ISA conditions, what altitude is 50% of pressure and density found at MSL?
A
Pressure - 18,000ft
Density- 22,000ft
2
Q
What does the atmosphere comprise of?
A
78% Nitrogen
21% oxygen
1% other gases
3
Q
At what rate does temperature decrease with height up to the tropopause?
A
2/1000ft (0.65/100m)
4
Q
What are the tropopause heights?
A
Average: 11km
Poles: 7-10km
Equator: 16-30km
5
Q
What temperature does ISA go to in the tropopause?
A
-56.5 Celsius
6
Q
What is 1013.25 hPa in inHg?
A
29.92
7
Q
What is the 4% rule?
A
There is 4ft error for every 10 degrees Celsius temperature deviation from ISA
8
Q
What is the SALR?
A
1.8/1000ft
0.6/100m
9
Q
What is the DALR?
A
3.0/1000ft
1.0/100m
10
Q
What is the equation to find relative humidity?
A
100 - 5 (temperature - dew point)
11
Q
Where is half the mass of the atmosphere?
A
5km
