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title: What is vacuum pressure in mbar?
description: "Pressure p (mbar) of fluids (gases and liquids). (Quantity: pressure; symbol: p; unit of measure: millibar; abbreviation: mbar.)"
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# What is vacuum pressure in mbar?

## Pressure p (mbar) of fluids (gases and liquids). (Quantity: pressure; symbol: p; unit of measure: millibar; abbreviation: mbar.)

Pressure p (mbar) of fluids (gases and liquids). (Quantity: pressure; symbol: p; unit of measure:millibar; abbreviation: mbar.) Pressure is defined in DIN Standard 1314 as the quotient of standardized force applied to a surface and the extent of ths surface (force referenced to the surface area). Even though the Torr is no longer used as a unit for measuring pressure (see Section 10), it is nonetheless useful in the interest of “transparency” to mention this pressure unit: 1 Torr is that gas pressure which is able to raise a column of mercury by 1 mm at 0 °C. (Standard atmospheric pressure is 760 Torr or 760 mm Hg.) Pressure p can be more closely defined by way of subscripts: 

- Absolute pressure pabs
- Total pressure pt
- Partial pressure pi
- Standard pressure pn
- Ultimate pressure pend
- Ambient pressure pamb
- Working pressure pW

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