What does vacuum (bara / barg) mean?
Bara and barg are units for pressure measurement. Bara describes the absolute pressure including atmospheric pressure, while barg indicates the relative pressure without this addition. Vacuum is measured in these units, with bara serving as the absolute reference and barg describing values in the vacuum range.
Explanation of a Vacuum (bara / barg)
In technology, the term "vacuum" is used whenever there is significantly less pressure than atmospheric pressure in a predefined vessel / space / tank under normal conditions. By removing the internal pressure, a mechanical inward-directed load is created in a vessel / space / tank due to the external pressure. The technical vacuum can be divided into several qualities / categories. The generated vacuum is defined by the remaining amount of matter in the vessel / tank / space. In industry, coarse vacuum is predominantly used, while in medical / chemical engineering, fine vacuum and below are often employed. The usual unit of measurement is Pascal (Pa), millibar (mbar), or Torr (torr / mmHg).
| Pressure range vacuum | Pressure in mbar |
|---|---|
| Normal pressure | 1013.5 |
| Rough vacuum | 300 ... 1 |
| Fine vacuum | 1 ... 10-3 |
| High vacuum (HV) | 10-3 ... 10-7 |
| Ultra high vacuum (UHV) | 10-7 ... 10-12 |
| Extreme high vacuum (XHV) | < 10-12 |
| Ideal vacuum (IV) | 0 |
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