Drawing from thousands of original research articles, this book focuses on new and emerging applications of supercritical water as a green solvent, including the catalytic conversion of biomass into fuels and the oxidation of hazardous materials. It begins with an introduction that defines supercritical fluids in general and then defines supercritical water in particular, using the saturation curve to illustrate its relationship to regular water. This book is written for students and professionals in physical chemistry, chemistry of water, chemical engineering, and organic chemistry interested in exploring the applications and properties of supercritical water.