Basic vacuum knowledge and vacuum terminology

- Jul 10, 2019-

Vacuum with Different Vacuum Degrees

Many years ago physicists defined the term "vacuum" and DIN (German Standardization Association) now provides a universally applicable definition, but in practice, engineers distinguish different forms of vacuum.

Vacuum refers to the gas state in a given space when the pressure is lower than a standard atmospheric pressure (1.013 mbar).

Vacuum should be selected according to different applications, such as relatively low vacuum for vacuum handling. Vacuum values are generally expressed in terms of vacuum, which ranges from 1 mbar to a standard atmospheric pressure (1013 mbar).

Definition in Relative Value

In the application of vacuum technology, vacuum is defined as a relative value, i.e. below ambient pressure.

Usually, we use atmospheric pressure as the reference value of environmental pressure and define it as 0 mbar, so vacuum is usually expressed in negative numbers.


Vacuum parameter measurement unit


The power required to create a vacuum

The high vacuum is not proportional to the high energy input. Increasing the vacuum from -600 mbar to -900 mbar increases the suction by 1.5 times, but the required pumping time and energy is increased by a factor of three.

Obviously, using too high a vacuum in vacuum handling technology is a very uneconomical solution.

Vacuum technology legend

In the field of spring sky technology, circuit diagrams and working schematics are also used. The various symbols represent different components and connections. The following figures show some of the most important and common symbols in our vacuum system.