Centimeters of Water Column – cmWC

cmWC (centimeters of water column) measures pressure relative to ambient pressure. It equals the pressure exerted by a 1 cm high freshwater column at 4°C.

Applications

  • HVAC: Measures pressure drops in ventilation systems (filters, fans).
  • Building Automation: Monitors pressure in plumbing (gas, water supply).
  • Medical Field: Measures low pressures (blood pressure – indirect, respiratory).
  • Industry: Measures pressure in processes with liquids/gases (pipelines, valves).

Conversion Table

cmWCPascal (Pa)Millimeters of Mercury (mmHg)
198.06650.7355
5490.33253.6775
10980.6657.355
252451.662518.3875

Conversion & Notes

  • 1 cmWC ≈ 98.0665 Pa (Pascal, SI unit).
  • cmWC is relative pressure, not absolute.
  • Water density varies with temperature (consider for high precision).
  • Related units: inWC (inches of water), mmHg (millimeters of mercury).

Concise Summary

cmWC is a practical unit for low-pressure measurements, offering a clear visualization based on water column height. While common across industries, SI units (Pa) are preferred for some scientific and technical applications due to consistency.

Related Terms

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