Remarks on alphabetical list in Section

The term degrees Celsius is a special name for the SI unit kelvin (K) [see no. 122] for indicating Celsius temperatures. The term degrees Celsius is legally approved. 

The revised version of DIN 1314 must be complied with. The specifications of this standard primarily apply to fluids (liquids, gases, vapors). In DIN 1314, bar (1 bar = 0.1 MPA = 10 Pa) is stated in addition to the (derived) SI unit, 1 Pa = 1 N m, as a special name for one tenth of a megapascal (Mpa). This is in accordance with ISO/1000 (11/92), p. 7. Accordingly the millibar (mbar), a very useful unit for vacuum technology, is also permissible 1 mbar = 10 Pa = 0.75 torr. The unit torr is no longer permissible. 

Exclusively absolute pressures are measured and used for calculations in vacuum technology. 

In applications involving high pressures, frequently pressures are used that are based on the respective atmospheric pressure (ambient pressure) Pg, [j According to DIN 1314, the difference between a pressure p and the respective atmospheric pressure (ambient pressure) Pg, [j is designated as overpressure p Pg = p - Pa b- The overpressure can have positive or negative values. 

1 atmosphere above atmospheric pressure (atmospheric overpressure) = 2026.50 mbar = 2 bar 

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