Here's why:
* Solid: Particles in a solid are tightly packed together in a fixed, rigid structure. They vibrate in place but don't move around freely.
* Liquid: Particles in a liquid are closer together than in a gas but have more freedom to move around.
* Gas: Particles in a gas are far apart and move around freely.
Think of it like this: Imagine a crowded dance floor (solid) where everyone is close together and can only move a little. Then imagine a less crowded room where people can move around more (liquid). Finally, imagine a huge empty field where people can move freely with lots of space between them (gas).
