6) Describe the differences between the troposphere and stratosphere. 7) What is the standard temperature lapse rate?

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

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

10) Define and describe pressure altitude.

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

12) What three factors change air density?

13) How does humidity affect aircraft performance? Do performance charts account for humidity?