Inch of water column (inH2O) - Pressure Unit - Definition, Application, Conversions

What is an inch of water column (inH2O)?

An inch of water column is a unit of pressure used mainly in the United States, based on the imperial measurement system. It is defined as the pressure exerted by a column of water one inch (1") high at a temperature of 4°C and normal gravitational acceleration. The unit designation for an inch of water column is inH2O.

The inch of water column is traditionally used where low pressure measurements are required.

Inch of water column, similar to mmH2O, is primarily used for low-pressure measurements. In the industrial hose sector, this unit has limited application. The working pressure of higher-capacity hoses is usually given in bars, PSI, or MPa.

When is an inch of water column used to measure pressure?

The inch of water column is used to measure pressure primarily in countries using the imperial measurement system. This unit is mainly used to measure low pressures.

These are the main applications of inch of water column pressure unit:

• HVAC (Heating, Ventilation, and Air Conditioning) engineering - inH2O is commonly used to measure pressure in ventilation and air conditioning systems. This is important to ensure adequate airflow and system efficiency. 
• Medicine - inH2O is used to measure the pressure in the lungs and respiratory system, which is crucial in pulmonology research and ventilator settings. 
• Industrial and scientific research - In industry and scientific research, especially where accurate low-pressure measurements are required, inH2O is used for experimentation and testing.

How to measure pressure in inches of water column?

To measure pressure in inches of water column (inH2O), you need the right measuring equipment, such as a manometer that can read in this unit or units that can be converted to inches of water.

Here are the steps to take:

1. Choose the right manometer - To measure pressure directly in units of the height of the liquid column (in this case water), you can use a liquid manometer. An alternative is digital manometers, which allow you to select the inH2O unit.
2. Identify the measuring point - Determine where you want to measure the pressure (e.g. in a plumbing, ventilation or industrial system).
3. Connect the manometer - If you are using a traditional liquid manometer, make sure it is vertical and that the pressure is acting on the water column. On the other hand, a digital manometer should be connected tightly to the measuring point for an accurate reading.
4. Read the result - The height of the water column in the tube of the liquid manometer indicates the pressure in inches of water column (inH2O). The reading is based on the difference in the water column levels on both sides of the manometer. In the case of a digital manometer, the measurement result will appear directly on the display.

If your device measures pressure in other pressure units, you can convert it to inches of water using the appropriate pressure converters.

Conversion of pressure unit inch of water column (inH2O)

• 1 inH2O = 0,00249082 bar
• 1 inH2O = 249,082 Pa
• 1 inH2O = 2,49082 hPa
• 1 inH2O = 0,249082 kPa
• 1 inH2O = 0,000249082 MPa
• 1 inH2O = 0,0024583 atm
• 1 inH2O = 0,0361263 PSI
• 1 inH2O = 25,4 mmH2O
• 1 inH2O = 1,86826 Tr
• 1 inH2O = 1,86826 mmHg
• 1 inH2O = 0,0735559 inHg
• 1 inH2O = 5,20232 PSF
• 1 inH2O = 0,00254 at
  

1 inch of water column (inH2O) = 0,00249082 bar = 249,082 Pa = 2,49082 hPa = 0,249082 kPa = 0,000249082 MPa = 0,0024583 atm = 0,0361263 PSI = 25,4 mmH2O = 1,86826 Tr = 1,86826 mmHg = 0,0735559 inHg = 5,20232 PSF = 0,00254 at

inH2O to Bar - Inch of water column to Bar pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Bar multiply the pressure in Inch of water column (inH2O) by 0,00249082.

• 1 inH2O to bar? 1 inH2O is equal to 0,00249082 bar
• 2 inH2O to bar? 2 inH2O is equal to 0,00498164 bar
• 5 inH2O to bar? 5 inH2O is equal to 0,0124541 bar
• 10 inH2O to bar? 10 inH2O is equal to 0,0249082 bar
• 20 inH2O to bar? 20 inH2O is equal to 0,0498164 bar
• 50 inH2O to bar? 50 inH2O is equal to 0,124541 bar
• 100 inH2O to bar? 100 inH2O is equal to 0,249082 bar
• 200 inH2O to bar? 200 inH2O is equal to 0,498164 bar
• 500 inH2O to bar? 500 inH2O is equal to 1,24541 bar
• 1000 inH2O to bar? 1000 inH2O is equal to 2,49082 bar

inH2O to Pa - Inch of water column to Pascal pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Pascal (Pa) multiply the pressure in Inch of water column (inH2O) by 249,082.

• 1 inH2O to Pa? 1 inH2O is equal to 249,082 Pa
• 2 inH2O to Pa? 2 inH2O is equal to 498,164 Pa
• 5 inH2O to Pa? 5 inH2O is equal to 1245,41 Pa
• 10 inH2O to Pa? 10 inH2O is equal to 2490,82 Pa
• 20 inH2O to Pa? 20 inH2O is equal to 4981,64 Pa
• 50 inH2O to Pa? 50 inH2O is equal to 12454,1 Pa
• 100 inH2O to Pa? 100 inH2O is equal to 24908,2 Pa
• 200 inH2O to Pa? 200 inH2O is equal to 49816,4 Pa
• 500 inH2O to Pa? 500 inH2O is equal to 124541 Pa
• 1000 inH2O to Pa? 1000 inH2O is equal to 249082 Pa

inH2O to hPa - Inch of water column to Hectopascal pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Hectopascal (hPa) multiply the pressure in Inch of water column (inH2O) by 2,49082.

• 1 inH2O to hPa? 1 inH2O is equal to 2,49082 hPa
• 2 inH2O to hPa? 2 inH2O is equal to 4,98164 hPa
• 5 inH2O to hPa? 5 inH2O is equal to 12,4541 hPa
• 10 inH2O to hPa? 10 inH2O is equal to 24,9082 hPa
• 20 inH2O to hPa? 20 inH2O is equal to 49,8164 hPa
• 50 inH2O to hPa? 50 inH2O is equal to 124,541 hPa
• 100 inH2O to hPa? 100 inH2O is equal to 249,082 hPa
• 200 inH2O to hPa? 200 inH2O is equal to 498,164 hPa
• 500 inH2O to hPa? 500 inH2O is equal to 1245,41 hPa
• 1000 inH2O to hPa? 1000 inH2O is equal to 2490,82 hPa

inH2O to kPa - Inch of water column to Kilopascal pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Kilopascal (kPa) multiply the pressure in Inch of water column (inH2O) by 0,249082.

• 1 inH2O to kPa? 1 inH2O is equal to 0,249082 kPa
• 2 inH2O to kPa? 2 inH2O is equal to 0,498164 kPa
• 5 inH2O to kPa? 5 inH2O is equal to 1,24541 kPa
• 10 inH2O to kPa? 10 inH2O is equal to 2,49082 kPa
• 20 inH2O to kPa? 20 inH2O is equal to 4,98164 kPa
• 50 inH2O to kPa? 50 inH2O is equal to 12,4541 kPa
• 100 inH2O to kPa? 100 inH2O is equal to 24,9082 kPa
• 200 inH2O to kPa? 200 inH2O is equal to 49,8164 kPa
• 500 inH2O to kPa? 500 inH2O is equal to 124,541 kPa
• 1000 inH2O to kPa? 1000 inH2O is equal to 249,082 kPa

inH2O to MPa - Inch of water column to Megapascal pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Megapascal (MPa) multiply the pressure in Inch of water column (inH2O) by 0,000249082.

• 1 inH2O to MPa? 1 inH2O is equal to 0,000249082 MPa
• 2 inH2O to MPa? 2 inH2O is equal to 0,000498164 MPa
• 5 inH2O to MPa? 5 inH2O is equal to 0,00124541 MPa
• 10 inH2O to MPa? 10 inH2O is equal to 0,00249082 MPa
• 20 inH2O to MPa? 20 inH2O is equal to 0,00498164 MPa
• 50 inH2O to MPa? 50 inH2O is equal to 0,0124541 MPa
• 100 inH2O to MPa? 100 inH2O is equal to 0,0249082 MPa
• 200 inH2O to MPa? 200 inH2O is equal to 0,0498164 MPa
• 500 inH2O to MPa? 500 inH2O is equal to 0,124541 MPa
• 1000 inH2O to MPa? 1000 inH2O is equal to 0,249082 MPa

inH2O to atm - Inch of water column to Atmosphere pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Atmosphere (atm) multiply the pressure in Inch of water column (inH2O) by 0,0024583.

• 1 inH2O to atm? 1 inH2O is equal to 0,0024583 atm
• 2 inH2O to atm? 2 inH2O is equal to 0,0049166 atm
• 5 inH2O to atm? 5 inH2O is equal to 0,0122915 atm
• 10 inH2O to atm? 10 inH2O is equal to 0,024583 atm
• 20 inH2O to atm? 20 inH2O is equal to 0,049166 atm
• 50 inH2O to atm? 50 inH2O is equal to 0,122915 atm
• 100 inH2O to atm? 100 inH2O is equal to 0,24583 atm
• 200 inH2O to atm? 200 inH2O is equal to 0,49166 atm
• 500 inH2O to atm? 500 inH2O is equal to 1,22915 atm
• 1000 inH2O to atm? 1000 inH2O is equal to 2,4583 atm

inH2O to PSI - Inch of water column to PSI pressure unit conversion

To convert pressure from Inch of water column (inH2O) to PSI multiply the pressure in Inch of water column (inH2O) by 0,0361263.

• 1 inH2O to PSI? 1 inH2O is equal to 0,0361263 PSI
• 2 inH2O to PSI? 2 inH2O is equal to 0,0722526 PSI
• 5 inH2O to PSI? 5 inH2O is equal to 0,1806315 PSI
• 10 inH2O to PSI? 10 inH2O is equal to 0,361263 PSI
• 20 inH2O to PSI? 20 inH2O is equal to 0,722526 PSI
• 50 inH2O to PSI? 50 inH2O is equal to 1,806315 PSI
• 100 inH2O to PSI? 100 inH2O is equal to 3,61263 PSI
• 200 inH2O to PSI? 200 inH2O is equal to 7,22526 PSI
• 500 inH2O to PSI? 500 inH2O is equal to 18,06315 PSI
• 1000 inH2O to PSI? 1000 inH2O is equal to 36,1263 PSI

inH2O to mmH2O - Inch of water column to Milimetre of water column pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Milimetre of water column (mmH2O) multiply the pressure in Inch of water column (inH2O) by 25,4.

• 1 inH2O to mmH2O? 1 inH2O is equal to 25,4 mmH2O
• 2 inH2O to mmH2O? 2 inH2O is equal to 50,8 mmH2O
• 5 inH2O to mmH2O? 5 inH2O is equal to 127 mmH2O
• 10 inH2O to mmH2O? 10 inH2O is equal to 254 mmH2O
• 20 inH2O to mmH2O? 20 inH2O is equal to 508 mmH2O
• 50 inH2O to mmH2O? 50 inH2O is equal to 1270 mmH2O
• 100 inH2O to mmH2O? 100 inH2O is equal to 2540 mmH2O
• 200 inH2O to mmH2O? 200 inH2O is equal to 5080 mmH2O
• 500 inH2O to mmH2O? 500 inH2O is equal to 12700 mmH2O
• 1000 inH2O to mmH2O? 1000 inH2O is equal to 25400 mmH2O

inH2O to torr - Inch of water column to torr pressure unit conversion

To convert pressure from Inch of water column (inH2O) to torr (Tr) multiply the pressure in Inch of water column (inH2O) by 1,86826.

• 1 inH2O to torr? 1 inH2O is equal to 1,86826 torr
• 2 inH2O to torr? 2 inH2O is equal to 3,73652 torr
• 5 inH2O to torr? 5 inH2O is equal to 9,3413 torr
• 10 inH2O to torr? 10 inH2O is equal to 18,6826 torr
• 20 inH2O to torr? 20 inH2O is equal to 37,3652 torr
• 50 inH2O to torr? 50 inH2O is equal to 93,413 torr
• 100 inH2O to torr? 100 inH2O is equal to 186,826 torr
• 200 inH2O to torr? 200 inH2O is equal to 373,652 torr
• 500 inH2O to torr? 500 inH2O is equal to 934,13 torr
• 1000 inH2O to torr? 1000 inH2O is equal to 1868,26 torr

inH2O to mmHg - Inch of water column to Milimetre of mercury column pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Milimetre of mercury column (mmHg) multiply the pressure in Inch of water column (inH2O) by 1,86826.

• 1 inH2O to mmHg? 1 inH2O is equal to 1,86826 mmHg
• 2 inH2O to mmHg? 2 inH2O is equal to 3,73652 mmHg
• 5 inH2O to mmHg? 5 inH2O is equal to 9,3413 mmHg
• 10 inH2O to mmHg? 10 inH2O is equal to 18,6826 mmHg
• 20 inH2O to mmHg? 20 inH2O is equal to 37,3652 mmHg
• 50 inH2O to mmHg? 50 inH2O is equal to 93,413 mmHg
• 100 inH2O to mmHg? 100 inH2O is equal to 186,826 mmHg
• 200 inH2O to mmHg? 200 inH2O is equal to 373,652 mmHg
• 500 inH2O to mmHg? 500 inH2O is equal to 934,13 mmHg
• 1000 inH2O to mmHg? 1000 inH2O is equal to 1868,26 mmHg

inH2O to inHg - Inch of water column to Inch of mercury column pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Inch of mercury column (inHg) multiply the pressure in Inch of water column (inH2O) by 0,0735559.

• 1 inH2O to inHg? 1 inH2O is equal to 0,0735559 inHg
• 2 inH2O to inHg? 2 inH2O is equal to 0,1471118 inHg
• 5 inH2O to inHg? 5 inH2O is equal to 0,3677795 inHg
• 10 inH2O to inHg? 10 inH2O is equal to 0,735559 inHg
• 20 inH2O to inHg? 20 inH2O is equal to 1,471118 inHg
• 50 inH2O to inHg? 50 inH2O is equal to 3,677795 inHg
• 100 inH2O to inHg? 100 inH2O is equal to 7,35559 inHg
• 200 inH2O to inHg? 200 inH2O is equal to 14,71118 inHg
• 500 inH2O to inHg? 500 inH2O is equal to 36,77795 inHg
• 1000 inH2O to inHg? 1000 inH2O is equal to 73,5559 inHg

inH2O to PSF - Inch of water column to PSF pressure unit conversion

To convert pressure from Inch of water column (inH2O) to PSF multiply the pressure in Inch of water column (inH2O) by 5,20232.

• 1 inH2O to PSF? 1 inH2O is equal to 5,20232 PSF
• 2 inH2O to PSF? 2 inH2O is equal to 10,40464 PSF
• 5 inH2O to PSF? 5 inH2O is equal to 26,0116 PSF
• 10 inH2O to PSF? 10 inH2O is equal to 52,0232 PSF
• 20 inH2O to PSF? 20 inH2O is equal to 104,0464 PSF
• 50 inH2O to PSF? 50 inH2O is equal to 260,116 PSF
• 100 inH2O to PSF? 100 inH2O is equal to 520,232 PSF
• 200 inH2O to PSF? 200 inH2O is equal to 1040,464 PSF
• 500 inH2O to PSF? 500 inH2O is equal to 2601,16 PSF
• 1000 inH2O to PSF? 1000 inH2O is equal to 5202,32 PSF

inH2O to at - Inch of water column to Technical atmosphere pressure unit conversion

To convert pressure from Inch of water column (inH2O) to Technical Atmosphere (at) multiply the pressure in Inch of water column (inH2O) by 0,00254.

• 1 inH2O to at? 1 inH2O is equal to 0,00254 at
• 2 inH2O to at? 2 inH2O is equal to 0,00508 at
• 5 inH2O to at? 5 inH2O is equal to 0,0127 at
• 10 inH2O to at? 10 inH2O is equal to 0,0254 at
• 20 inH2O to at? 20 inH2O is equal to 0,0508 at
• 50 inH2O to at? 50 inH2O is equal to 0,127 at
• 100 inH2O to at? 100 inH2O is equal to 0,254 at
• 200 inH2O to at? 200 inH2O is equal to 0,508 at
• 500 inH2O to at? 500 inH2O is equal to 1,27 at
• 1000 inH2O to at? 1000 inH2O is equal to 2,54 at