An engineering pressure unit where 1 meter of water column ≈ 9,806.65 pascals, representing the static pressure exerted by a 1-meter-high water column. Commonly used for pump head ratings (e.g., “head: 30 mH2O”), building plumbing systems, and HVAC water pressure calculations. Widely used in field engineering in China and Europe due to its intuitive correlation with water height.

An engineering pressure unit where 1 meter of water column ≈ 9,806.65 pascals, representing the static pressure exerted by a 1-meter-high water column. Commonly used for pump head ratings (e.g., “head: 30 mH2O”), building plumbing systems, and HVAC water pressure calculations. Widely used in field engineering in China and Europe due to its intuitive correlation with water height.