Thermal chemistry is the branch of science which is applicable in chemistry, physics, engineering, material science and medical science. The principal objective of this book is to stimulate interest in research that will extend available theory towards a greater understanding of the steps involved in metal complexes decompositions, properties of metal complexes and kinetic parameter data consider with to calculate Half decomposition temperature, Activation energy, Frequency factor, Entropy change and Free energy change. This book is designed to cover the “Thermal Chemistry” use to calculate the thermal method and water loss in chemical complexes. This book is applicable for Research students of Ph.D / Project of M.E / M.Tech / M.Sc / B.E. / B.Tech and all engineering, biochemical, biomedical, scientific courses. It provides various concepts of thermal Chemistry with different thermograms and references. It covers up the recent need of thermal chemistry for Ph.D research students, Industrial thermal workers, medical and engineering courses as per requirement of Indian and various other universities and industries. It focuses on three chapters with various references and method.