Convert Millimeters of Water to Kilobars
Convert Millimeters of Water (mmH₂O) to Kilobars (kbar) instantly and accurately.
Conversion Formula
kbar = mmH₂O × 9.806650000e-8
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.
About Kilobars
A kilobar (kbar) = 1,000 bar = 100 MPa = 10⁸ Pa - standard in high-pressure geophysics and experimental petrology. Earth mantle phase transitions: olivine → wadsleyite at ~130-140 kbar (410 km depth); post-spinel transition at ~230 kbar (660 km). Diamond anvil cells routinely reach 100-400 kbar for materials synthesis and equation-of-state measurement. High-pressure synthesis of cubic boron nitride (~50 kbar) and superhard materials uses large-volume presses. Explosive shock pressures for mining and demolition: 100-1,000 kbar. 1 kbar = 100 MPa.
Quick Reference Table
| Millimeters of Water (mmH₂O) | Kilobars (kbar) |
|---|---|
| 1 mmH₂O | 9.807 × 10-8 kbar |
| 2 mmH₂O | 1.961 × 10-7 kbar |
| 5 mmH₂O | 4.903 × 10-7 kbar |
| 10 mmH₂O | 9.807 × 10-7 kbar |
| 25 mmH₂O | 2.452 × 10-6 kbar |
| 50 mmH₂O | 4.903 × 10-6 kbar |
| 100 mmH₂O | 9.807 × 10-6 kbar |