Convert Inches of Mercury to Petapascals
Convert Inches of Mercury (inHg) to Petapascals (PPa) instantly and accurately.
Conversion Formula
PPa = inHg × 3.386388640e-12
About Inches of Mercury
One inch of mercury (inHg) ≈ 3,386 Pa - the primary barometric pressure unit in US aviation and meteorology. ASOS weather stations, METARs, and altimeter settings in the US report in inHg. Standard sea-level pressure is 29.92 inHg. Altimeters are set to local QNH in inHg to maintain altitude reference. US barometers for home weather stations display inHg. Typical pressure range: 28.5-31.0 inHg in continental weather systems. Record low: ~25.70 inHg (Typhoon Tip, 1979). 1 inHg = 3,386.39 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 Mercury (inHg) | Petapascals (PPa) |
|---|---|
| 1 inHg | 3.386 × 10-12 PPa |
| 2 inHg | 6.773 × 10-12 PPa |
| 5 inHg | 1.693 × 10-11 PPa |
| 10 inHg | 3.386 × 10-11 PPa |
| 25 inHg | 8.466 × 10-11 PPa |
| 50 inHg | 1.693 × 10-10 PPa |
| 100 inHg | 3.386 × 10-10 PPa |