This book is written exclusively for students of various branches of engineering, keeping in view their professional requirements, after entering into their practical life many new products of the chemical industries are finding increasing application in all the fields of engineering. The scope of their application is mostly dictated by their chemical behavior under a given set of conditions. For instance, an ideal selection of an appropriate metal, metal, alloy, or combination of metals, the design of an equipment to minimum corrosion, the selection of a proper lubricating oil to minimize friction and wear, the selection of suitable additives for a special cement or the selection of their ripe type of a ceramic, plastic or rubber for satisfactory performance for a given purpose under a given set conditions can be made only on the basis of the chemical properties of materials, even more than on their physical properties because slight changes in chemical composition may alter the physical properties considerably. Engineering is a discipline that involves application of scientific knowledge and principles to develop and design structures, systems, devices, materials and processes.