Here's why:

* Solids: Particles in a solid are tightly packed and vibrate in fixed positions. They have the strongest attractive forces between them, resulting in a rigid structure.

* Liquids: Particles in a liquid are closer together than in a gas, but they can move around and slide past each other. This allows liquids to flow.

* Gases: Particles in a gas are far apart and move freely in all directions. They have the weakest attractive forces between them.

Think of it like this: imagine a classroom full of students.

* Solid: Students are sitting close together in their desks, barely moving.

* Liquid: Students are standing close together, but they can move around and change positions.

* Gas: Students are running around the room, bumping into each other but mostly independent.