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
cmWC | Pascal (Pa) | Millimeters of Mercury (mmHg) |
---|---|---|
1 | 98.0665 | 0.7355 |
5 | 490.3325 | 3.6775 |
10 | 980.665 | 7.355 |
25 | 2451.6625 | 18.3875 |
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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