Convert Petapascals to Millimeters of Water
Convert Petapascals (PPa) to Millimeters of Water (mmH₂O) instantly and accurately.
Conversion Formula
mmH₂O = PPa × 101971621300000
About Petapascals
A petapascal (PPa) = 10¹⁵ Pa - pressures found in stellar interiors. The Sun's centre is ~25 PPa, sustained by radiation pressure from nuclear fusion balanced against gravity. White dwarf stars: ~10⁴ PPa (electron degeneracy). Neutron stars: ~10⁹-10¹⁰ PPa, where nuclear structure fails and neutrons drip from nuclei at ~4 × 10⁸ PPa (the neutron drip line). The hadron-quark phase transition in the densest neutron star cores is estimated at 10¹⁰-10¹² PPa. No laboratory experiment can approach petapascal pressures. 1 PPa = 10¹⁵ 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
| Petapascals (PPa) | Millimeters of Water (mmH₂O) |
|---|---|
| 1 PPa | 1.02 × 1014 mmH₂O |
| 2 PPa | 2.039 × 1014 mmH₂O |
| 5 PPa | 5.099 × 1014 mmH₂O |
| 10 PPa | 1.02 × 1015 mmH₂O |
| 25 PPa | 2.549 × 1015 mmH₂O |
| 50 PPa | 5.099 × 1015 mmH₂O |
| 100 PPa | 1.02 × 1016 mmH₂O |