Pressure measuring units

We often see pressure gauges with many types of pressure measurement units from mbar, bar, psi, kg/cm2, Kpa, Mpa ... so why are there so many different types of units used? The first is because during the cold war there were two schools, Europe and America, they always offered different standards for measurement such as: pressure measurement unit, mechanical connection standard, including volume measurement, Altimeters also use different units. That's why today there are so many different types and standards of measurement that make the use of devices difficult.

Conventional pressure gauges only display one type of pressure measurement unit, Bar or Psi, but there are also some other types that display two units at the same time so that we can see both easily. . With such a display, it can be confusing for beginners who are familiar with pressure gauges and other types of pressure measurement units.

There are 5 types of standard pressure measurement units as follows:
Calculated in single "metric" converted to standard 1 bar pressure unit

1 bar = 0.1 Mpa ( megapascal )

1 bar = 1.02 kgf/cm2

1 bar = 100 kPa ( kilopascal )

1 bar = 1000 hPa ( hetopascal )

1 bar = 1000 mbar ( milibar )

1 bar = 10197.16 kgf/m2

1 bar = 100000 Pa ( pascal )

Calculated in "pressure" converted to standard 1 bar pressure unit

1 bar = 0.99 atm ( physical atmosphere )

1 bar = 1.02 technical atmosphere

Calculated according to the "measurement system" converted to standard 1 bar pressure unit

1 bar = 0.0145 Ksi ( kilopoud lực trên inch vuông )

1 bar = 14.5 Psi ( pound lực trên inch vuông )

1 bar = 2088.5 ( pound per square foot )

Calculated in "head of water" converted to standard pressure unit 1 bar

1 bar = 10.19 mét nước ( mH2O )

1 bar = 401.5 inc nước ( inH2O )

1 bar = 1019.7 cm nước ( cmH2O )

Calculated in "mercury" converted to standard pressure unit 1 bar

1 bar = 29.5 inHg ( inch of mercury )

1 bar = 75 cmHg ( centimetres of mercury )

1 bar = 750 mmHg ( milimetres of mercury )

1 bar = 750 Torr

Based on the above spreadsheet, we can convert all types of pressure measurement units available in the world today.