Atmospheric Pressure Flashcards
1
Q
Air density is primarily influenced by what 3 components?
A
Atmospheric pressure
Air temperature
Moisture content of air
2
Q
Air pressure and air density are?
A
Directly proportional
3
Q
International atmosphere. (ISA)
At mean sea level
A
15”C 59 Fahrenheit
4
Q
Hpa at mean sea level
A
1013.2
5
Q
Hg( inches of mercury)
A
29.92hg
6
Q
Temperature lapse rate
A
2”C/1000ft
7
Q
Pressure lapse rate in inches
A
1”/1000ft
8
Q
Pressure lapse rate in Hpa
A
1hpa/30ft
9
Q
High density altitude occurs when
A
Barometric pressure is less than 1013.2hpa, temperature is warmer than standard and the air is moist
10
Q
A low density altitude occurs when
A
Barometric is greater than 29.92Hg, the temperature is colder than standard and the air is dry
11
Q
Low density altitude results in?
A
Better than average aircraft performance
