Question

question 1
which of the following air masses would be the most dense?
a cold, moist air
b warm, moist air
c cold, dry air
d warm, dry air

Explanation:

Air density is affected by temperature and moisture. Cold air is denser than warm air (molecules are closer together). Dry air (lower water - vapor content) is denser than moist air (since water vapor is less dense than the main components of air like nitrogen and oxygen). So, cold, dry air combines the two factors (cold and dry) that increase density.

Answer:

C. Cold, dry air