Here's why:
* Solids: Particles in solids are tightly packed together and vibrate in fixed positions. The strong forces of attraction between them hold them in a rigid structure. This is why solids have a definite shape and volume.
Let's compare to other states:
* Liquids: Particles in liquids are closer than in gases but have more freedom to move around. The forces of attraction are weaker than in solids, allowing liquids to flow.
* Gases: Particles in gases are far apart and move freely. The forces of attraction are very weak, making gases compressible and able to expand to fill their container.
So, the strength of the forces between particles directly affects the state of matter.
