The physical forms of matter you described are called states of matter.

Here's a breakdown:

* Solid: A state of matter characterized by a fixed shape and volume. The particles are tightly packed together and vibrate in place.

* Liquid: A state of matter that has a fixed volume but takes the shape of its container. Particles are closer together than in a gas, but they can move around each other.

* Gas: A state of matter that has no fixed shape or volume. Particles are far apart and move freely.

So, instead of calling them "physical forms," we usually refer to them as the states of matter.