**Millimetres of water column** (measurement of the pressure drop through a medium)

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**1 millimeter of water column corresponds to 9.80665 Pascal**. The mmH2O pressure unit is used to monitor low air flow pressures in building ventilation systems or very low water levels in rivers and streams.

The pressure unit mmWS stands for **millimeters per water column** and 1 mmWS = 9.8*10-5 bar = 9.8*10-8 mbar = 0.0014 PSI = 0.0098 mPa. Pascal (Pa) is the SI unit of pressure and 1 mPa is 1/1000th of a Pa.

The abbreviation m.c.a. means **meters of water** and corresponds to a unit of pressure in the engineering system of units, equal to the pressure exerted by a one meter tall column of pure water. Its equivalent is: 1 m.c.a. = 0.1 kg/cm² = 9.81 kPa (kilopascals) 1 m.c.a. = 1000mm.

By using our water column [millimeters] to mmHg conversion tool, you will know that one water column [millimeter] is equal to 0.073556127270818 mmHg. So to convert water column [millimeters] to mmHg, all we have to do is **multiply the number by 0.073556127270818**.

Millibar is a metric unit of pressure used primarily in European countries and is directly derived from the bar unit of pressure, which is equivalent to 1,000 mbar.

- 1 cmH2O Masse = 1000 kg/m³ x 1 m² x 0,01 m = 10 kg.
- 1 cmH2O Kraft = 10 kg x 80665 m/s² = 90665 N.
- 1 cmH2O Druck = 90665 N / 1 m² = 90665 Pa.

- https://www.sensorsone.com/mmh2o-millimetres-water-column-4-deg-c-pressure-unit/
- https://howthingsfly.si.edu/ask-an-explainer/how-convert-pressure-psi-mbar-and-mmwc-mbar-and-mpa-psiplz-send-conversion-table-0
- https://elias.es/en/faq/what-does-m-c-a-mean/
- https://hextobinary.com/unit/pressure/from/watercolmm/to/mmHg
- https://www.sensorsone.com/mbar-millibar-pressure-unit/
- https://www.unitconverters.net/volume/cubic-millimeter-to-liter.htm
- https://www.sensorsone.com/cmh2o-centimetres-water-column-4-deg-c-pressure-unit/

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