Vacuum Gauge
{{Cat main, Vacuum system Vacuum Systems A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and express ...

Engineering Disciplines
Engineering is the discipline and profession that applies scientific theories, mathematical methods, and empirical evidence to design, create, and analyze technological solutions cognizant of safety, human factors, physical laws, regulations, practicality, and cost. In the contemporary era, engineering is generally considered to consist of the major primary branches of chemical engineering, civil engineering, electrical engineering, and mechanical engineering. There are numerous other engineering sub-disciplines and interdisciplinary subjects that may or may not be part of these major engineering branches. Chemical engineering Chemical engineering is the application of chemical, physical and biological sciences to the process of converting raw materials or chemicals into more useful or valuable forms. Civil engineering Civil engineering comprises the design, construction, and maintenance of the physical and natural built environments. Electrical engineering Electrical enginee ...
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