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A mechanical system manages power to accomplish a task that involves forces and movement. Mechanical is derived from the Latin word machina,[1] which in turn derives from the Doric Greek µa?a?? (machana), Ionic Greek µ??a?? (mechane) "contrivance, machine, engine"[2] and that from µ???? (mechos), "means, expedient, remedy".[3]

The Oxford English Dictionary[4] defines the adjective mechanical as skilled in the practical application of an art or science, of the nature of a machine or machines, and relating to or caused by movement, physical forces, properties or agents such as is dealt with by Mechanics. Similarly Merriam-Webster Dictionary[5] defines "mechanical" as relating to machinery or tools.

Power flow through a mechanical system provides a way to understand the performance of devices ranging from levers and gear trains to automobiles and robotic systems.

mechanical system, Any building service using machines. They include plumbing, elevators, escalators, and heating and air-conditioning systems. The introduction of mechanization in buildings in the early 20th century brought about major adjustments; the new equipment demanded floor space, and the design team began to include electrical and HVAC (heating, ventilating, and air-conditioning) engineers. Heating and cooling changed dramatically. Modern buildings, with their large heat gains, turned central heating into little more than a supplement. Heat removal is a much more serious burden, especially in warm weather. The roofs of high-rises are occupied by cooling towers and mechanical penthouses; entire floors are often dedicated to the containment of blowers, compressors, water chillers, boilers, pumps, and generators. 

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