Question

question 8 of 10
which statement is true about the temperature and density of air?
a. lower temperature air is less dense.
b. the temperature and density of air are not related.
c. lower temperature air is more dense.
d. the less air there is, the higher the temperature and density.

Explanation:

To determine the correct statement about the temperature and density of air, we analyze each option:

• Option A: Lower - temperature air actually has molecules closer together (more dense), so A is false.
• Option B: Temperature and density of air are related (via gas laws, e.g., ideal gas law \( PV = nRT \), where density \(

ho=\frac{m}{V} \) and temperature affects volume/pressure), so B is false.

• Option C: When air temperature decreases, its molecules move slower and occupy less volume (for a fixed mass/pressure), increasing density. This matches the relationship between temperature and density (inverse relationship under typical conditions), so C is true.
• Option D: Less air (lower mass) would lead to lower density (for fixed volume), and temperature is not directly tied to "less air" in this way. So D is false.

Answer:

C. Lower temperature air is more dense.