In general, solids have a higher density compared to liquids and gases. Density is a measure of how much mass is contained within a given volume. Since solids have tightly packed particles with little space between them, they tend to have a higher mass per unit volume, resulting in a higher density.
Liquids have particles that are less closely packed compared to solids, allowing them to flow and take the shape of their container. They generally have a lower density compared to solids but higher density compared to gases.
Gases have particles that are widely separated and move freely, filling the entire volume of their container. They have the lowest density among the three states of matter due to the large amount of empty space between the particles.
However, it's important to note that the density of a specific substance can vary depending on factors such as temperature and pressure.