1. Solid: Has a fixed shape and volume. The particles are tightly packed together and vibrate in place.

2. Liquid: Has a fixed volume but takes the shape of its container. The particles are closer together than in a gas but can move around freely.

3. Gas: Has no fixed shape or volume and fills its container. The particles are far apart and move randomly.

Let me know if you'd like to learn more about these states of matter!