Final answer:
The density and temperature of air are related; warm air is less dense than cool air due to increased molecular energy, resulting in lower density. At higher altitudes, air density decreases, and air temperature falls as molecules are spread farther apart.
Explanation:
Density and temperature of air are related through the concept that warm air is less dense than cool air. This is because warm air molecules have more energy, causing them to be more active and spread apart, resulting in lower density. Additionally, as altitude increases, air density decreases, and air temperature falls at higher altitudes as molecules are spread farther apart.
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