Gases have lower densities than liquids or solids.
The reason for this lies in the arrangement and movement of particles in different states of matter. In solids, particles are closely packed together in a fixed structure, which results in a high density. In liquids, the particles are still close, but they can move around each other, leading to a slightly lower density than solids.
Gases, on the other hand, have particles that are far apart and move freely. This large amount of space between gas particles contributes to their low density compared to liquids and solids. Additionally, gases can be compressed, which further exemplifies their lower density characteristics. Thus, when comparing the three states of matter, gases definitely possess lower densities.