chapter one the atmosphere

Question 1

if gas is put in a closed container, it will expand and fill the container entirely and total pressure will drop (true/false)

Answer 1

True

If you put the gas in a small container and put it into a lager container, the volume is greater, the gas expands and the pressure will drop

Question 2

The air can hold more water vapor at a lower temperature. (true/false)

Answer 2

False, water vapor will not exist in colder temperatures because the molecules have less open space between them.

The amount of water vapor the air can hold has a positive relationship with temperature. As temperature decreases, the amount of water vapor the air can hold decrease.

Question 3

What is the composition of dry air?

Answer 3

nitrogen 78 %
oxygen 21%
other gases Mostly Argon 1%

Question 4

What are the four atmospheric layers?

Answer 4

troposphere, stratosphere, ionosphere and exophere

Question 5

What is the standard temperature lapse rate?

Answer 5

2 degrees per 1,000 feet up to 36,000 feet. Above this altitude, the temperature remains fairly constant to about 80,000 feet.

Question 6

What is the standard pressure in pounds per square inch (psi) at sea level on a standard day?

Answer 6

14.7 psi, 29.99inches of mercury or 1013.25 millibars

Question 7

Does atmospheric pressure decrease with an increase in altitude? does it decrease proportionally?

Answer 7

Yes, the atmospheric pressure decreases with and increase in altitude. The higher the altitude, the less air that is pushing down on you.

Question 8

Define and describe pressure altitude.

What is it used for?

Answer 8

Pressure altitude is the height above the standard datum plate (SDP) which is the theoretical level where the weight of the atmosphere is 29.92 in Hg (1013.2 mb) as measured by the barometer.
It is used as a basis to determine aircraft performance and for assigning flight level.

Question 9

Define and describe density altitude. What effect does density altitude have on aircraft performance?

Answer 9

Density altitude is pressure corrected for nonstandard temperature. As the density of the air increases, (lower density altitude), aircraft performance increases; conversely, as air density decreases (higher density altitude), aircraft performance decreases.

Question 10

What three factors change air density?

What is not accounted for when calculating aircraft performance?

Answer 10

Altitude, temperature, and humidity.

humidity is not taken into consideration when calculating aircraft performance

Question 11

What is definition of temperature? What happens when the temperature rises or falls

Answer 11

The speed of the movement of molecules. The hotter the temperature the faster the molecules move, The colder the temperature is, the molecules begin to condense moving slower and become more restricted.

Question 12

Where does most of the earths weather occur, in what two layers?

Answer 12

start in troposphere and stratosphere

Question 13

What happens to temperature in the troposphere?

Answer 13

as altitude increases temperature decreases

Question 14

What happens to temperature in the stratosphere?

Answer 14

as altitude increases temperature stays the same or slightly increases

Question 15

What is between the troposphere and stratosphere? What occurs there?

Answer 15

the tropopause contains ozone

Question 16

What would be the station pressure in Denver at 5,000 feet elevation on a standard day.

Answer 16

24.92

Question 17

A decrease in air density means higher or lower density altitude?

Answer 17

higher density altitude

Question 18

A increase in air density mean and higher or lower density altitude?

Answer 18

lower density altitude

Question 19

What is density altitude used to calculate?

Answer 19

its used to calculate aircraft performance, because under standard atmospheric conditions, air at each level in the atmosphere not only has a specific density, its pressure altitude and density altitude identify the same level.

Question 20

By how much on average do you increase the density altitude per feet for every 1 degree above standard?

Answer 20

120 feet for every 1 degree above standard

Question 21

density altitude definition in (George Comollo’s terms)

Answer 21

The altitude you feel that your at.

Question 22

What weighs more dry air or wet air?

Answer 22

Dry air. Moist air is lighter in weight.

Question 23

if you have moisture in the air, does the density increase or decrease?

Answer 23

decrease

Question 24

The larger the airplane, does the variables change more or less?

Answer 24

more

Question 25

1. concentration of where you find the most oxygen?

2. highest concentration of the atmosphere?

Answer 25

1. most concentration of oxygen is contained below 35,000 feet
2. 50% of the atmosphere is 18,000 feet and below

Question 26

What element(s) of flight would you have to adjust if you have an environment where the temperature increases or added humidity to make sure they are account for ? (HIGH DENSITY ALTITUDE ENVIRONMENT)

Answer 26

adjust thrust and/or have to reduce weight.

Question 27

What element(s) of flight would you have to adjust if you have an environment where the temperature increases or added humidity to make sure they are account for ? (HIGH DENSITY ALTITUDE ENVIRONMENT)

Answer 27

adjust thrust and/or have to reduce weight.

Question 28

What would happen to the amount of humidity or water vapor in the air as the temperature increases?

Answer 28

it will increase

Question 29

if you reach complete saturation, what would be the relative humidity value?

Answer 29

100 saturation