Solids have freely moving particles, liquids have particles that vibrate in place, and gases have fixed particles.

Solids have a random arrangement with fast-moving particles, liquids have a structured arrangement, and gases have closely packed particles.

Solids have a fixed arrangement with limited movement, liquids have a less ordered arrangement with more movement, and gases have a very random arrangement with fast movement.

Solids are completely still, liquids have medium movement, and gases have the most movement with fixed arrangements.