Here's why:
* Solids: Particles in solids are tightly packed and vibrate in fixed positions. They cannot move around freely.
* Liquids: Particles in liquids are close together but can move around each other. This allows liquids to flow and take the shape of their container.
* Gases: Particles in gases are far apart and move freely in all directions. They have a lot of space to move around.
So, liquids are the state of matter where particles have the ability to move around one another.
