Why are gases highly compressible, while liquids and solids are almost incompressible?

Gases are highly compressible because their particles are very far apart and have large empty spaces between them. When pressure is applied, these particles can be forced closer together, significantly reducing the volume. In contrast, liquids and solids have particles that are already closely packed with very little empty space between them. Therefore, applying pressure has a negligible effect on their volume, making them almost incompressible.