An adiabatic process occurs when A) no thermal energy enters ...

[dbose]

An adiabatic process occurs when
 
  A) no thermal energy enters or leaves the system.
  B) thermal energy leaving a system is greater than thermal energy entering a system.
  C) thermal energy leaving a system is less than thermal energy entering a system.
  D) none of these

Question 2

At the same level and temperature in the atmosphere, is moist air lighter or heavier than dry air?
 
  What will be an ideal response?

[poopface]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: Moist air is lighter Think of the thundercloud where warm moist air continues to rise upward until it reaches the point where it can no longer hold its moisture. Warm moist air rises more readily than warm dry air. Note also the chemical composition of moist air and dry air. Dry air is mainly N2 (atomic mass 28) and O2 (atomic mass 32). Moist air has N2 and O2, but it is also diluted with H2O (atomic mass 18). Because the increased percentage of water molecules in moist air means a decreased percentage of heavier nitrogen and oxygen molecules, moist air is lighter than dry air.

[dbose]

Thank you!

[poopface]

Always glad to help...