Question

part a cold air is than hot air. hot air is than cold air. more dense

Explanation:

Step1: Recall the relationship between density and particle arrangement

Density is related to how closely particles are packed. In cold air, particles are more closely packed as shown in the diagram.

Step2: Determine the density comparison

Since cold air has more particles in a given volume (more closely - packed), it is more dense. Hot air has fewer particles in the same volume (more spread - out), so it is less dense.

Answer:

Cold air is more dense than hot air. Hot air is less dense than cold air.