These pressure units which belong to the metric unit system where the bar is defined as being exactly equal to 100,000 pascals.

These pressure units belong to the SI measurement system where the pascal is derived from the SI units by the following formulas: 1 kg

Density of mercury at 0 deg C is 13,595.1 kg/m³.

Density of pure water at 4 deg C is 1000 kg/m³.

Standard acceleration due to gravity of 9.80665 m/s².

The above manometric pressure units assume the following in their derivation and although they are not physical constants they have been accepted as popular conventions and are used universally: The use of manometric units is discouraged by national standard organisations because they do not precisely represent the true pressure and there are differing conventions used for the temperature and density of the liquid which can lead to variation in accuracy. The physical assumptions that these conversions factors are based can be found at the bottom of this section. Since the pressure of the fluid column can vary with changes in liquid density and local gravity it is important to quantify these factors when using these units. The pascal is the SI unit for measuring pressure. Each manometric pressure unit is shown with its equivalent value converted into pascals (Pa). The following units are known as manometric pressure units and are derived from the pressure exerted by a column of liquid under the acceleration of earth’s gravity. Numbers which include on the end are rounded. These units have an internationally agreed definition for the conversion factor, some have an exact value with very few digits, while others have a lot of digits and may vary very slightly between reference sources, depending on the level of precision used when calculating the values. The following list shows each pressure unit and its equivalent value converted into pascals (Pa).

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Conversion TablesĬhoose a look up table for a specific pressure conversion application.

Conversion GuideĬonvert pressure units with the pressure unit converting tool, look up a conversion from the tables, identify a pressure unit and its group association with other pressure units, or find the relevant pressure conversion factor in pascals. You can also copy and paste values into this converter, after pasting a value, click or touch the input box to convert the value.

The conversion will show in the lower answer box.Select the units to convert to, from the lower shortcut buttons or pull down options.Select the corresponding units from the upper shortcut buttons or pull down options.Enter the value you want to convert in the upper input box.This converter and dynamic conversion scale will calculate the equivalent pressure value from one pressure measurement unit to another and generate a conversion table based on the selected units. Units derived from ‘pascal’ the SI unit for pressure.

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