Metal pump

Machinery is one of the five essential elements for production and service in modern society, namely people, capital, energy, materials, and machinery. Machinery is a combination of artificial physical components. There is a definite relative motion between the various parts of the machinery. In addition to the characteristics of mechanisms, machines must also possess a third characteristic, which is the ability to replace human labor to complete useful mechanical work or convert mechanical energy. Therefore, machines are mechanisms that can convert mechanical energy or complete useful mechanical work. From the perspective of structure and motion, there is no difference between mechanisms and machines, and they are generally referred to as machines.