Sally M. Walker 
Investigating Matter [PDF ebook] 

Solids, liquids, and gases are the three states of matter. But have you ever made matter change from one state to another? Or seen how even invisible matter takes up space? Now you can! Explore matter with the fun experiments you’ll find in this book. As part of the Searchlight Books(TM) collection, this series sheds light on a key science question-How Does Energy Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!