The Association of the British Pharmaceutical Industry
Abpi: Solids, Liquids, and Gases
Students learn about solids, liquids, and gases in this interactive slide show. Animated cartoon characters explain concepts having to do with properties of matter. A self-checking quiz follows the lesson.
American Chemical Society
Middle School Chemistry: Changing State: Evaporation
Learn how substances change from a liquid to a gaseous state in the process of evaporation.