Convert Millipascals to Millimeters of Water
Convert Millipascals (mPa) to Millimeters of Water (mmH₂O) instantly and accurately.
Conversion Formula
mmH₂O = mPa × 0.0001019716213
About Millipascals
A millipascal (mPa) is 10⁻³ Pa. It appears primarily in rheology as the millipascal-second (mPa·s = centipoise) for dynamic viscosity: water at 20°C is 1.002 mPa·s; olive oil ~80 mPa·s; honey 2,000-10,000 mPa·s. Food technology, polymer processing, pharmaceutical formulation, and inkjet printing all specify flow behaviour in mPa·s. Partial pressures of trace atmospheric gases and ultra-high-vacuum leak rates measured by residual gas analysers are also expressed in millipascals. 1 mPa = 10⁻³ Pa.
About Millimeters of Water
One millimetre of water column (mmH₂O) = pressure from 1 mm of fresh water at standard gravity = exactly 9.80665 Pa. Preferred for very low differential pressures in HVAC: ductwork static pressures, fan curves, filter resistance, and building pressurisation are in mm WC. Gas valve operating pressures are typically 0.5-3 mm WC; clean-room cascade differentials 12-25 mm WC. A domestic gas hob manifold operates at ~20 mm WC on natural gas. Also used in spirometer calibration and hospital oxygen delivery systems. 1 mmH₂O = 9.80665 Pa.
Quick Reference Table
| Millipascals (mPa) | Millimeters of Water (mmH₂O) |
|---|---|
| 1 mPa | 0.000101972 mmH₂O |
| 2 mPa | 0.000203943 mmH₂O |
| 5 mPa | 0.000509858 mmH₂O |
| 10 mPa | 0.00101972 mmH₂O |
| 25 mPa | 0.00254929 mmH₂O |
| 50 mPa | 0.00509858 mmH₂O |
| 100 mPa | 0.0101972 mmH₂O |