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Different regions employ different pressure measurement units, resulting in a multitude of them. Hence, pressure gauges often display numerous units such as Pa, bar, kPa, Mpa, Psi... This article aims to provide a comprehensive understanding of pressure measurement units.
Pressure is a physical quantity defined as force per unit area acting perpendicular to the surface of an object.
The significance of pressure measurement in industry:
- Pressure measurement ensures equipment safety.
- Facilitates the monitoring and control of machinery operations.
1. Pa unit
Pascal (symbol: Pa) is a unit of pressure in the International System of Units (SI). 1 Pascal is the pressure exerted by a force of 1 Newton acting on an area of 1 square meter.
Note:
- In the legal measurement system in Vietnam, 1 Pa = 1 N/m2.
- However, due to the small size of Pa, a larger unit commonly used in practice is the bar, where: 1 bar = 100,000 Pa.
The pressure unit Pa is widely used in Asian countries, particularly in Japan. It is applied in industries such as electricity, steel production, construction, and in various machinery and equipment like pressure gauges, pressure sensors, air compressors, water heaters, etc.
2. kPa Unit
Kilopascal (symbol: kPa) is a unit of pressure, derived from Pascal (Pa).
Conversion: 1 kPa = 1000 Pa.
kPa pressure gauge
The kPa unit is widely used globally in fields such as construction and various industries including steel manufacturing, electricity generation, wastewater treatment, etc.
The kPa unit is used in devices such as pressure gauges, pressure testing equipment, to measure devices like air compressors, boiler pressure, hydraulic pressure, pressure of vacuum cleaners,...
3. Mpa Unit
Megapascal (symbol: Mpa) is a unit of pressure in the International System of Units (SI). MPa is derived from Pascal (Pa).
Conversion: 1 Mpa = 1000 Kpa = 1,000,000 Pa.
Mpa pressure gauge
Asian countries, especially Japan, often utilize the Mpa pressure unit. Mpa is used in electronics industry, machinery, water treatment plants, pumping stations,...
The Mpa measurement unit is employed in pressure gauges of air compressors, pressure measuring devices, industrial measuring instruments, car wash machines, boiler pressure, hydraulic pressure, various pumps,...
4. Bar Unit
Bar is a unit of pressure, though not part of the International System of Units (SI). The bar unit was introduced by Norwegian meteorologist Vilmus Bjerknes (the founder of modern weather forecasting methods).
Conversion: 1 bar = 100,000 Pa.
Bar pressure gauge
The bar unit is widely used in Europe, most commonly in industrialized countries such as England, Germany, France. Bar is used in factories, workshops, laboratories, warehouses,...
Pressure gauges with bar unit are used and installed in various types of machinery such as air compressors, air dryers, car wash machines,...
5. Psi Unit
Pounds per square inch (symbol: Psi) is a unit of pressure and stress originating from North America.
Conversion: 1 Psi = 6895 Pa.
Note: In the engineering field, Psi is simply a unit of pressure measurement.
Psi pressure gauge
Psi unit is predominantly used in North America, especially in the United States, commonly employed for measuring pressure of liquids and gases.
Psi unit is often found on pressure gauges or pressure sensors originating from the United States, used for measuring the pressure of compressed air and hydraulic systems.
6. Atmosphere Unit
Standard Atmospheric Pressure (symbol: atm) is a unit of pressure measurement, not part of the International System of Units (SI).
Conversion: 1 atm = 101,325 Pa.
Atmosphere pressure gauge
Atmospheric pressure atm is used to measure and determine atmospheric pressure such as pressure sensors, atmosphere pressure gauges,...
7. Unit Conversion for Pressure Measurement
Each region, each country will use a different pressure measurement unit. Therefore, the conversion table between pressure units below will facilitate easy unit conversion.
(Pound lực trên inch vuông) Psi | (milibar) mbar | (bar) bar | (Átmốtphe kỹ thuật) atm | (pascal) Pa | (kilopascal) kPa | (megapascal) Mpa | |
Psi | 1 | 68.95 | 0.0689 | 0.0681 | 6895 | 6.895 | 0.006895 |
mbar | 0.0145 | 1 | 0.001 | 0.000967 | 100 | 0.1 | 0.0001 |
bar | 14.504 | 1000 | 1 | 0.987 | 100000 | 100 | 0.1 |
atm | 14.7 | 1013.25 | 1.01325 | 1 | 101325 | 101.325 | 0.1013 |
Pa | 0.000145 | 0.01 | 0.00001 | 0.00001 | 1 | 0.001 | 0.000001 |
kPa | 0.14504 | 10 | 0.01 | 0.00987 | 1000 | 1 | 0.001 |
Mpa | 145.04 | 10000 | 10 | 9.87 | 1000000 | 1000 | 1 |
This article has introduced the 7 most common pressure measurement units today. Hopefully, after reading, you will have a better understanding of each pressure measurement unit.
