Convert Inches of Water to Petapascals
Convert Inches of Water (inH₂O) to Petapascals (PPa) instantly and accurately.
Conversion Formula
PPa = inH₂O × 2.490889100e-13
About Inches of Water
One inch of water column (inH₂O or in WC) = pressure from 1 inch of fresh water at standard gravity ≈ 249.09 Pa. The standard unit for low-pressure measurement in US HVAC and plumbing: ductwork static pressure, fan performance, filter ratings, and gas appliance manifold pressures are all specified in inches WC. Household natural gas supply pressure is typically 7 in WC (0.25 psi). Blower door tests for building air-tightness use 50 Pa ≈ 0.2 in WC test pressure. 1 inH₂O = 249.089 Pa.
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.
Quick Reference Table
| Inches of Water (inH₂O) | Petapascals (PPa) |
|---|---|
| 1 inH₂O | 2.491 × 10-13 PPa |
| 2 inH₂O | 4.982 × 10-13 PPa |
| 5 inH₂O | 1.245 × 10-12 PPa |
| 10 inH₂O | 2.491 × 10-12 PPa |
| 25 inH₂O | 6.227 × 10-12 PPa |
| 50 inH₂O | 1.245 × 10-11 PPa |
| 100 inH₂O | 2.491 × 10-11 PPa |