The degree of gas rarefaction is an objective measure of vacuum

The degree of gas rarefaction is an objective measure of vacuum, and the direct physical measure is the number of gas molecules per unit volume. The lower the density of gas molecules, the lower the gas pressure, and the higher the vacuum. However, due to historical reasons, measuring vacuum is usually expressed in terms of pressure. Pascal or Torr are commonly used as units of pressure in vacuum.

The development of vacuum equipment manufacturing

The research report on the development of vacuum equipment manufacturing industry elaborates on the development process of the world's vacuum equipment manufacturing industry, analyzes the current situation and gap of China's vacuum equipment manufacturing industry, and innovatively proposes the concept of "new vacuum equipment manufacturing industry" and substitute industry.

Introduction to Vacuum Technology

Vacuum technology is the technology required to establish a physical environment below atmospheric pressure, as well as to conduct process manufacturing, physical measurements, and scientific experiments in this environment. Vacuum technology mainly includes four aspects: vacuum acquisition, vacuum measurement, vacuum leak detection, and vacuum application. In the development of vacuum technology, these four aspects of technology are mutually reinforcing.