* Mass is a fundamental property of matter. It's the amount of "stuff" in an object.

* The state of matter (solid, liquid, gas) depends on the arrangement and movement of molecules.

Here's how it relates to mass:

* A solid, liquid, or gas can have the same mass. It depends on the *amount* of the substance.

* A given amount of a substance will have the same mass whether it's a solid, liquid, or gas. The molecules are just arranged differently.

For example:

* 1 gram of ice (solid water) has the same mass as 1 gram of liquid water and 1 gram of water vapor (gas).

Key point: The state of matter doesn't determine mass, but rather how the molecules are arranged and their movement.