* Particle Arrangement and Movement:
* Gases: Gas particles are widely spaced and move freely and randomly. They have no fixed position or shape.
* Liquids: Liquid particles are closer together than gas particles, but still move around. They have a fixed volume but take the shape of their container.
* Solids: Solid particles are tightly packed in a fixed arrangement and vibrate in place. They have a fixed shape and volume.
* Intermolecular Forces:
* Gases: Weak intermolecular forces allow particles to easily move past each other.
* Liquids: Stronger intermolecular forces than gases, but weaker than solids, allow particles to slide past each other.
* Solids: Strongest intermolecular forces hold particles in a rigid structure.
Rigidity refers to the resistance to deformation. Because gas particles are free to move, they offer very little resistance to change in shape or volume. Liquids are more resistant to deformation than gases, but less so than solids.
Think of it this way:
* Gas: Imagine air in a balloon. It easily expands and takes the shape of the balloon.
* Liquid: Imagine water in a glass. It takes the shape of the glass but maintains its volume.
* Solid: Imagine a block of ice. It has a fixed shape and volume and is very difficult to deform.
