What is matter?

Photographs and simple text describe solids.

Photographs and simple text describe liquids.

Photographs and simple text describe gases.

Guides readers through the basics of solids, as well as how it can change from one state to another.

Guides readers through the basics of liquids, as well as how it can change from one state to another.

Guides readers through the basics of gases, as well as how it can change from one state to another.