Today we are here to share with you a topic that is important but often overlooked in the field of hermetic testing - the differentiation and conversion of different pressure units.
We are using theAirtightness Tester,Helium Leak DetectormaybeSealing test equipmentWhen we often see different pressure units such as:Pascal (Pa), kilopascal (kPa), megapascal (MPa), bar, millibar (mbar), millimetre of water column (mmH2O), inch of water column (inH2O), kilogram force per square centimetre (kg/c㎡), standard atmospheric pressure (atm), inch of mercury (inHg), millimetre of mercury (mmHg), and pounds per square inch (psi).etc. It can be really confusing as to what they really mean.
Pascal (Pa) is the standard pressure unit of the International System of Units (SI), 1 Pa equals 1 Newton / square meter (N/m2); kilopascal (kPa) is often used to express atmospheric pressure; megapascal (MPa) is suitable for high-pressure applications; bar is equal to one hundred kilopascals; millibar (mbar) is equal to one hundred pascals.
The millimeter water column (mmH2O) and inch water column (inH2O) represent millimeters and inches of water column and are commonly used in the biomedical field; the kilogram force per square centimeter (kg/cm2 ) is a unit used to measure pressure and is commonly used in the scientific and engineering fields; atm stands for standard atmospheric pressure; the inch of mercury (inHg) and millimeters of mercury (mmHg) are inches and millimeters of mercury column and are commonly used in the meteorological inHg and mmHg are inches and millimeters of mercury, often used in meteorology; psi is pounds per square inch, the American unit.
Specific definitions and conversions are given below:
Pascal (Pa):The pascal is the international standard unit of pressure, defined as pressure per square meter. It is the most basic unit of pressure. Conversion: 1 kilopascal (kPa) = 1000 Pa, 1 megapascal (MPa) = 1,000,000 Pa.
- kilopascal (kPa):The kPa is a common unit of pressure, defined as pressure per square kilometer. This is the unit commonly used in airtightness testing. Conversion: 1 megapascal (MPa) = 1000 kilopascals (kPa), 1 bar = 100 kilopascals (kPa).
- Megapascals (MPa):The megapascal is a common unit for large pressures, defined as the pressure per square megameter. It is the unit used to measure larger pressures. Conversion: 1 kilopascal (kPa) = 0.001 megapascal (MPa), 1 bar = 0.1 megapascal (MPa).
- Bar:The bar is a common unit of pressure, defined as one million pascals per square meter. This is the unit commonly used in airtightness testing. Conversion: 1 kilopascal (kPa) = 0.01 bar, 1 megapascal (MPa) = 10 bar.
- Millibars (mbar):Millibar is the unit used for smaller pressures, defined as pressure per square kilopascal. This is the unit commonly used in airtightness testing. Conversion: 1 kPa = 10 mbar, 1 bar = 1000 mbar.
- Millimeter water column (mmH2O):Millimeters of water column is a unit of pressure expressed in terms of the height of the water column, defined as the pressure generated per millimeter of height of the water column. This is the unit commonly used in liquid pressure measurements. Conversion: 1 millimeter of water column (mmH2O) = 0.009807 kilopascals (kPa).
- Kilogram force per square centimeter (kgf/c㎡):Kilogram force per square centimeter is a unit of pressure in kilogram force, defined as pressure per square centimeter. This is the unit used in specific fields. Conversion: 1 kilogram force per square centimeter (kgf/c㎡) = 98.07 kilopascals (kPa).
- Standard atmospheric pressure (atm):Standard atmospheric pressure is a unit of pressure defined as the pressure at standard atmospheric pressure. This is the unit used for the more common. Conversion: 1 standard atmospheric pressure (atm) = 101.325 kilopascals (kPa).
- inches of mercury (inHg):An inch of mercury is a unit of pressure expressed in terms of the height of a column of mercury, defined as the pressure generated by a column of mercury per inch of height. It is a unit commonly used in meteorology. Conversion: 1 inch of mercury (inHg) = 3.386 kilopascals (kPa).
- Millimeters of mercury (mmHg)/Torr:The millimeter of mercury (mmHg) or torr is a unit of pressure expressed in terms of the height of a column of mercury, defined as the pressure generated per millimeter of height of the column. It is a unit commonly used in meteorology and medicine. Conversion: 1 millimeter of mercury (mmHg) = 0.1333 kilopascals (kPa).
- inches of water column (inH2O):The inch water column is a unit of pressure expressed in terms of the height of a column of water, defined as the pressure generated by a column of water per inch of height. It is commonly used to measure the pressure of liquids or gases in pipelines, tanks and other containers. Conversion: 1 inch of water column (inH2O) ≈ 0.2491 kilopascals (kPa).
- Pound force per square inch (psi):psi is an abbreviation for pounds per square inch, a unit used to measure pressure and commonly used in the American system. It represents the force exerted per square inch. psi is commonly used in engineering, construction, and automotive industries. Conversion: 1 psi ≈ 6.895 kilopascals (kPa).
Summarize
We hope this article is helpful for you to understand the common pressure units and their conversion methods in the airtightness testing industry. If you have any questions or need further information, please feel free to contact JCGK, we will be happy to provide you with support and answers.
