How does temperature relate to density?

Question

A
As temperature decreases, density decreases.
B
As temperature increases, density increases.
C
As temperature decreases, density increases.
D
Temperature does not change density.

Answer 1

The relationship between temperature and density depends on the state of matter and the specific substance in question, but generally, the correct answer in most cases is:

A: As temperature decreases, density decreases.

This is because, for most substances, when the temperature increases, molecules move faster and tend to spread apart, leading to a decrease in density. Conversely, when temperature decreases, molecules slow down and are typically more closely packed together, increasing density.

However, it's important to note that exceptions exist, such as water, which has a maximum density at around 4°C and becomes less dense as it freezes. But for most substances, the direct relationship can be summarized as stated above.