This is the first modern approach to thermodynamics written specifically for a first undergraduate course. It covers the fundamental formalism with some attention given to its history; describes basic applications of the formalism and continues with a number of additional applications that instructors can use according to their particular degree program these chapters cover thermal radiation, biological systems, nano systems, classical stability theory, and principles of statistical thermodynamics. A wide range of examples appear throughout the book from biological, engineering and atmospheric systems. Each chapter contains a bibliography and numerous examples and exercises.  An accompanying web site will provide students with information and links to data sources and other thermodynamics-related sites, and instructors will be able to download complete solutions to exercises.