Question

A decrease in outside air temperature,

a)decreases density of air.
b)increases density of air.
c)decreases density altitude.
d)Answers B & C above.
e)None of the above.

Answer 1

A decrease in outside air temperature increases the density of air and decreases density altitude, so the correct answer is d) Answers B & C above.

Step-by-step explanation:

A decrease in outside air temperature has a direct effect on the density of air. When the temperature of the air decreases, the molecules within the air move slower and tend to be closer together, which results in an increase in the density of air. Additionally, a term relevant to aviation and meteorology is density altitude, which is the altitude relative to the standard atmosphere conditions at which the air density would be equal to the density being experienced. A decrease in temperature would lower the density altitude because cold air is denser than warm air. Therefore, the correct answer to the question is d) Answers B & C above.