Mechanical engineering is an engineering branch that combines engineering physics and mathematics principles with materials science to design, analyze, manufacture, and maintain mechanical systems. It is one of the oldest and broadest of the engineering branches. It involves the production and usage of heat and mechanical power for the design, production, and operation of machines and tools.Technically, mechanical engineering is the application of the principles and problem-solving techniques of engineering from design to manufacturing to the marketplace for any object. Disciplines within mechanical engineering include acoustics, aerospace, automation, automotive and so on.