What is a gas?

K-Gr 3-Excellent introductions to the concept of matter. In each book, matter is clearly defined, as are the different forms it can take. Although the opening section is similar from book to book, different photographs and examples are provided, so the titles are not overly repetitive. Each one then moves on to describe the subject. Numerous "What do you think?" sidebars offer simple experiments that add interest and enhance understanding. For example, in Solid, readers are encouraged to dissolve sugar in milk. All photography is crisp and clear. These volumes will attract browsers and be invaluable for classroom teaching. (c) Copyright 2012. Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.