Thermodynamics is a very important part of physical science. When discussing thermodynamics, we can explore heat, thermal expansion, and insulation, as well as changes in state, thermal equilibrium, and thermal energy. In this chapter, the experiments illustrate some of the key thermal physics phenomena from different perspectives. An understanding of heat and thermodynamics will help you understand why heat behaves the way it does. Teacher background information, assessment, safety notes, references, additional resources, and a keyword glossary are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, About the Authors, An Introduction to Phenomenon-based Learning, Appendix, Credits, and Index.