Branch of engineering concerned with the design, manufacture, installation, and operation of engines , machines , and manufacturing processes.
Mechanical engineering involves application of the principles of dynamics , control, thermodynamics and heat transfer, fluid mechanics , strength of materials , materials science , electronics , and mathematics . It is concerned with machine tools , motor vehicles, textile machinery, packaging machines, printing machinery, metalworking machines, welding, air conditioning, refrigerators, agricultural machinery, and many other machines and processes essential to an industrial economy.