Barnitz, Edward S. Consultant in Vacuum Engineering, Rochester, New York.
Last reviewed:August 2020
- Mechanical pumps
- Ejector pumps
- Specialty pumps
- Vacuum pumping equations
- Related Primary Literature
- Additional Reading
A device that reduces the pressure of a gas (usually air) in a container. When gas in a closed container is lowered from atmospheric pressure, the operation constitutes an increase in vacuum in this container. The unit used for vacuum is a millimeter (mm) column of mercury (Hg). Another term for the mmHg unit is the torr. These terms are used interchangeably. The torr is named in honor of E. Torricelli, a pioneer in vacuum technology. The various vacuum regions are classified as follows:
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