You're absolutely right! The four fundamental physical forms of matter are:

* Solid: Has a definite shape and volume. The particles are tightly packed and vibrate in fixed positions.

* Liquid: Has a definite volume but takes the shape of its container. Particles are closer together than in a gas, but can move around.

* Gas: Has no definite shape or volume. Particles are far apart and move freely.

* Plasma: Similar to gas but with some of its atoms ionized, meaning they have lost or gained electrons. This gives plasma unique electrical and magnetic properties.

Let me know if you have any other questions!